JP3093073B2 - Optical connector core position measuring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical connector core position measuring device for detecting eccentricity between a design position where an optical fiber is arranged on an end face of an optical connector to be measured and an optical fiber position actually fixedly arranged. Things.

[0002]

2. Description of the Related Art Conventionally, techniques in such a field include:
For example, "High-precision Dimension Measurement Technology for Multi-core Connectors" (Showa 6
3rd year IEICE Fall National Convention, B-343).

FIG. 13 is a block diagram showing a conventional optical connector core position measuring device.
Is set on an XY stage (not shown, a movable stage in the X and Y directions), and measurement light is emitted from the light source 302 to the rear end face. An image pickup device 304 such as a CCD is disposed on the front end face side of the optical connector 301 for measurement with an objective lens 303 interposed therebetween, and an image of the front end face of the optical connector 301 for measurement is formed on the image pickup device 304. .

Here, the optical connector 301 to be measured is provided with two guide pin holes 305 on both sides, and a number of fiber holes 306 are formed between them. For this reason, the measurement light emitted from the light source 302 passes through the guide pin hole 305 and the fiber hole 306 and becomes the transmission measurement light to enter the imaging device 304. The image processing apparatus 307 includes the optical connector 3 for measurement.
The image data of the measurement light from the front end face of the light-emitting element 01 is given.

[0005] Therefore, the image processing device 307 can determine the contour of the edge of the front end face of the guide pin hole 305 and the fiber hole 306, and the center position of the guide pin hole 305 and the fiber hole 306 can be obtained from the result. Therefore, if the measured center position is compared with the designed center position, the so-called eccentric amount and eccentric direction are obtained,
Product evaluation becomes possible. Note that the CRT 308 displays the imaging data and the measurement result so as to be visible.

[0006]

As described above, the conventional optical connector core position measuring apparatus can evaluate the eccentricity (deviation between the designed position and the actual position) of the fiber hole. Due to the presence of the clearance, the eccentricity of the optical fiber inserted here cannot be evaluated. Therefore, when an optical fiber is inserted and actually used as an optical connector, there is a problem that a suitable optical coupling cannot be performed.

In addition, the guide pin hole, which is a reference for positioning, has a problem that "sagging" is apt to occur at the front end face due to polishing, and the center position cannot be calculated accurately.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and it is intended that a deviation between a design position where an optical fiber is arranged on an end face of an optical connector to be measured and an optical fiber position actually fixedly arranged is determined. An object of the present invention is to obtain a core position measuring device of an optical connector to be detected.

[0009]

According to a first aspect of the present invention, there is provided an optical connector core position measuring apparatus comprising: a single optical fiber opposed to an optical fiber whose front end face is fixedly arranged at a predetermined pitch in an optical connector to be measured; The electrostriction element supporting the reference connector is fixed, and the moving stage that moves horizontally on the linear guide that is installed in parallel to the end face of the optical connector to be measured is moved to the design position at a predetermined pitch by the stage moving means. The measurement light emitted from the light source installed on the rear end face side of the optical fiber on the side of the optical connector under measurement is measured by the position detection means via the reference connector which is circularly moved by the circular motion controller. Detect the direction of eccentricity from the center of the reference connector from the phase difference between this circular motion and the fluctuation in the amount of light of the measuring light. It is characterized by determining the amount of eccentricity al.

In particular, in the optical connector under test, a dummy pipe having a through hole at the center portion is inserted into a guide pin hole formed at the end face, or an optical fiber is inserted into the through hole of the dummy pipe. And a structure in which the measurement light passes through the center of the guide pin hole.

According to a fifth aspect of the present invention, there is provided an optical connector core position measuring apparatus comprising: a reference connector comprising one optical fiber opposed to an optical fiber having a front end face fixedly arranged at a predetermined pitch on an optical connector to be measured. An electrostrictive element to be supported is fixed, and a moving stage that horizontally moves on a linear guide installed in parallel to an end face of the optical connector to be measured is sequentially moved to a design position at a predetermined pitch by a stage moving means. In the position detecting means, the measuring light is emitted from the light source to the front end face of the optical fiber through the reference connector that is making a circular motion by the circular motion controller, and the reflected light reflected at the rear end face is detected. The direction of eccentricity from the center of the reference connector is determined from the phase difference from the variation in the light amount of the measurement light, and the deviation from the center of the reference connector is determined from the amplitude of the variation in the light amount. It is characterized by determining the amount.

In particular, in the optical connector under test, a dummy pipe having a through hole at the center portion is inserted into the guide pin hole,
Further, an optical fiber is inserted into the through hole of the dummy pipe so that the reflected light passes through the center of the guide pin hole.

[0013]

In the optical connector core position measuring apparatus according to the present invention, a linear guide for horizontally moving the reference connector is disposed in parallel with the end face of the optical connector to be measured, so that the reference connectors are arranged at a predetermined arrangement pitch. By moving the optical connector, the reference connector sequentially takes a position facing each optical fiber formed on the end face of the optical connector to be measured.

In the optical connector under test, a dummy pipe having a through hole at the center portion is inserted into the guide pin hole so that the measuring light passes through the center of the guide pin hole. Since the optical fiber is inserted so that the measuring light or the reflected light passes through the center of the guide pin hole, the relative positional relationship between the end face of the optical connector to be measured and the moving position of the reference connector is specified.

The measuring light used for specifying the position is set to a wavelength longer than the cutoff wavelength of the optical fiber, so that these optical fibers are in single mode, and when detecting this measuring light, Has a light source installed on the rear end face side of these optical fibers to directly detect the measurement light passing through the optical fiber, and the reflectance on the rear end face side of the optical fiber is substantially constant (3.5%). Therefore, the reflected light can be detected by installing the light source on the front end side of the optical fiber.

[0016]

1 to 12 show an embodiment of the present invention.
This will be described with reference to FIG. In the drawings, the same portions are denoted by the same reference numerals, and description thereof is omitted.

FIG. 1 is a block diagram showing the configuration of an embodiment of an optical connector core position measuring apparatus according to the first aspect, and a moving stage that moves horizontally on a linear guide 6 having an accurate linear scale 7. An electrostrictive element 10 that supports the reference connector 15a and is controlled by the circular motion controller 4 to perform circular motion is fixed on the moving stage 9.

The stage moving means A for controlling the horizontal movement of the moving stage 9 includes a scale counter 1 for detecting an accurate position of the moving stage 9 from the scale detecting head 8.
And a moving stage controller 2 as a driving means.

The position detecting means B includes a reference connector 1
A detector that detects a phase difference from a circular movement of the electrostrictive element 10 and an amplitude of the light quantity fluctuation from the light quantity fluctuation of the measurement light (light emitted from the light source 14 and passing through the optical fiber 15b) transmitted via the reference numeral 5a. 3 and the eccentric direction from the center of the reference connector 15a and the reference connector 15
It comprises a CPU 5 for calculating the amount of eccentricity from the center a.

On the other hand, in the optical connector under test 11, the front end face of one or more optical fibers 15b is fixedly arranged on the end face of the optical connector 11 under test at a predetermined pitch. At least two guide pin holes 12 for determining the position of the guide pin are provided.

A dummy pipe 13 having a through hole at the center is inserted into the guide pin hole 12, and an optical fiber 15b for passing measurement light from the light source 14 is inserted into the through hole. I have.

In particular, in the position detecting means B and the circular motion controller 4, as shown in FIG. 2, the detector 3 detects the measuring light transmitted from the reference connector 15a (optical fiber) by the light receiving device 31, and After the detection signal is amplified by the amplifier 32, the first and second phase detectors 33a and 33b
Respectively detect the phase in the x direction and the phase in the y direction (the phase of the detected light quantity fluctuation of the measurement light). The detected signal is used as a reference signal 35 in the circular motion controller 4.
Are converted to digital signals by the first and second A / D converters 34a and 34b, and C is used as a calculation parameter.
Sent to PU5.

The CPU 5 calculates the direction of eccentricity from the center of the reference connector 15a from the outputs of the first and second phase detectors 33a and 33b, and calculates the amount of eccentricity from the center of the reference connector 15a from the amplitude of the light quantity fluctuation. I do.

In the circular motion controller 4, sin
X for circular motion output from the wave generation circuit 41,
The circular motion control unit 42 controls the circular motion of the electrostrictive element 10 by the sin wave in each of the y directions, and the xy control unit 43 controls the electrostrictive element 1 according to the instruction of the CPU 5.
A voltage for finely moving 0 in the X-axis or Y-axis direction is supplied.

Next, the operation of the present invention will be described.

First, the optical connector 11 to be measured is fixed by a guide pin or the like (not shown) so that the linear guide 6 is disposed so as to face horizontally in advance. At this time, it should be noted that the distance between the end face of the optical connector 11 to be measured and the linear guide 6 must be equal from any position, and that the end face of the reference connector 15a on the linear guide 6 and the measured Optical fiber 15 fixedly arranged on the end face of optical connector 11
This is the point that the front end face b must be parallel as shown in FIG. The best way to achieve this is to mechanically fix it with a guide pin or the like.

A light source 14 for specifying the core position of each optical fiber 15b on the optical connector 11 to be measured.
Is mounted on the rear end face side of each optical fiber 15b and moves horizontally in synchronization with the horizontal movement of the reference connector 15a so as to emit the measuring light to the rear end face of the optical fiber 15b to be sequentially measured. The wavelength of the measurement light emitted from the light source 14 is longer than the cutoff wavelength of the reference connector 15a (optical fiber) and the optical fiber 15b on the side of the optical connector 11 to be measured. Ensure single mode.

As a first operation stage, first, each of the optical fibers 15b fixedly arranged on the end face of the optical fiber 11 to be measured.
Must be specified (this is to correct the above-described error when installing the optical connector 11 to be measured). For this reason, the CPU 5 instructs the moving stage controller 2 of the stage moving means A to move the reference connector 15a to a position facing the designed center position of each guide pin hole 12 on the end face of the optical connector 11 to be measured.

At this time, the moving stage controller 2
The moving stage 9 is horizontally moved in accordance with the value of the linear counter 1 indicating the current position of the moving stage 9 from the output of the scale detecting head 8 that reads the linear scale 7, and the reference connector 1 is accurately positioned at a position corresponding to each design position.
5a is moved.

On the other hand, as shown in FIG. 4, a dummy pipe 13 having a through hole in the center of the guide pin hole 12 is inserted into the guide pin hole 12 in the optical connector 11 to be measured. The measurement light is emitted from the light source 14 to the rear end face (FIG. 10A), and FIG.
As shown in (1), the center position of the guide pin hole 12 is specified so as to be measurable, or an optical fiber 15b is further inserted into a through hole at the center of the dummy pipe 13, and the light source 14 is inserted into the rear end face of the optical fiber 15b. By emitting the measurement light (FIG. 8B), the center position of the guide pin hole 12 is specified so as to be measurable as shown in FIG. 8C.

When the reference connector 15a moves to the design position, the CPU 5 instructs the circular motion controller 4 to perform circular motion control. As a result, the reference connector 15a is caused to make a circular motion by the supported electrostrictive element 10 (the electrostrictive element 10 is controlled in a circular motion by the circular motion controller 4). In the position detecting means B which has detected the transmitted measuring light, the eccentric direction and eccentricity of the core position of the reference connector 15a and each optical fiber 15b are determined from the phase difference between the circular motion and the fluctuation of the light amount of the measuring light and the amplitude of the fluctuation of the light amount. The amount is calculated.

Further, the CPU 5 applies the eccentricity information of each guide pin hole 12 calculated in the above-mentioned first operation stage to each of the optical fibers 15b fixedly arranged on the end face of the optical connector 11 to be measured. The correction position is specified as correction information for specifying a design position (original position) where the measurement optical connector 11 is shifted in the same way as the end surface is shifted.

This is because while the reference connector 15a actually moves horizontally at an accurate design pitch and horizontally, it is difficult to accurately fix the end face of the optical connector 11 to be measured.

Here, referring to FIG. 5 and FIG.
0 and the circular motion control by the circular motion controller 4 will be described.

First, FIG. 5 is a perspective view (a) and a sectional view (b) showing the electrostrictive element 10. The body portion of the electrostrictive element 10 is fixed to the moving stage 9, an optical fiber serving as a reference connector 15 a is inserted from the back (left side in the figure), and the outer surface of the tip of the electrostrictive element 10 (right side in the figure). Is provided with four piezoelectric units. That is, the piezoelectric material layer 102 is deposited on the ground electrode 101 _G provided on the outer surface of the tip of the electrostrictive element 10, and four more electrodes 101 _X1 and 101 _X are formed on the upper surface of the piezoelectric material layer 102.
_X2 , _101Y1 , and _101Y2 are provided.

In particular, the positive X electrode 101 _X1 and the negative X
The electrodes 101 _X2 are located at positions facing each other, and similarly, the plus Y electrodes 101 _Y1 and the minus Y electrodes 101 _Y2 are also located at positions facing each other. A cap 103 is provided in a lower opening (right side in the drawing) of the electrostrictive element 10, and a reference connector 15 a is penetrated and fixed (supported) in the cap 103.

According to the above structure, the electrostrictive element 10
Can be finely or rotationally moved horizontally (horizontally with respect to the end face of the optical connector 11 to be measured), whereby the tip of the reference connector 15a can also be moved according to the above movement. FIG. 6 (a) shows this.
(B).

When a voltage having the pattern shown in FIG. 6B is applied to each of the electrodes shown in FIG. 6A, tensile or compressive strain occurs in the piezoelectric material layer 102.
0 is slightly deformed, and fine movement in the direction of displacement of the arrow (circle 1 to circle 4) shown in FIG.

Accordingly, the xy controller 43 _applies 180 ° to the plus X electrode 101 _X1 and the minus X electrode 101 _X2 .
When a sine wave voltage shifted in phase is applied, and the sine wave voltage shifted in phase by 90 ° is applied to the plus Y electrode _101Y1 and the minus Y electrode _101Y2 , the tip of the electrostrictive element 10 rotates. . The electrodes 101 _X1 to 10 1 to 10
When the DC bias of the AC voltage applied to 1 _Y1 changes, the tip of the electrostrictive element 10 slightly moves in a direction orthogonal to the optical axis of the reference connector 15a.

That is, the high-speed rotational movement of the reference connector 15a and the fine adjustment of the horizontal rotational center position are performed by the same electrostrictive element 10.

Next, in the second operation stage, the CPU 5 moves the stage moving means A to the position (design position) where the other optical fibers 15b fixedly arranged on the end face of the optical connector 11 to be measured should be arranged. ) Is instructed to sequentially move the reference connector 15a. At this time, in synchronization with the movement of the reference connector 15a, the light source 14 also moves to emit measurement light to the rear end face of the optical fiber whose position is to be measured next.

Further, the CPU 5 controls the circular motion controller 4.
Is issued, and the eccentric direction and the amount of eccentricity of the core position of each optical fiber 15b are sequentially obtained while correcting using the eccentricity information calculated in advance in the first operation stage. .

Here, referring to FIGS. 7 and 8, the eccentric direction and the amount of eccentricity (center position) between the center of rotation of the reference connector 15a and the center of each optical fiber 15b in the optical connector 11 to be measured opposing thereto. The principle of calculation (performed by the position detecting means B) will be described.

First, in FIG. 7A, a solid circle (20a in the figure) indicates the core of the reference connector 15a, and a dotted circle (20b in the figure) indicates each optical fiber in the optical connector 11 to be measured. The center of rotation of the reference connector 15a (white circle mark 200a in the figure) is positioned from the center of each optical fiber 15b (cross mark 200b in the figure).
The figure shows a case where the beam is deviated by a certain amount in the minus x direction. The position of the core of the rotating reference connector 15a changes as indicated by the circles 1 to 5 in the figure, so that the optical coupling rate between the reference connector 15a and each optical fiber 15b changes according to the rotation phase. .

In FIG. 7, (b) to (f) correspond to FIG.
4A shows the positional relationship between the core of the reference connector 15a and the core of each optical fiber 15b shown in FIG. 5A individually, where 201a to 201e are actual center positions of the reference connector 15a in a circular motion. Is shown.

Here, the measuring light emitted from the light source 14 and passing through each optical fiber 15b is detected by the detector 3 via the reference connector 15a. And each optical fiber 15b
This corresponds to the variation of the optical coupling ratio with the optical fiber.

Accordingly, the positional relationship between the center position of the rotation of the reference connector 15a and the center position of the optical fiber 15b, and the relationship between the phase of the rotational movement and the phase of the light quantity fluctuation of the measuring light detected by the detector 3 are illustrated. , As shown in FIG.

That is, FIG. 8A shows the center position 20 of the core 20a in the reference connector 15a.
0a shows a positional relationship in which the center position 200b of the core in the optical fiber 15b is shifted in the minus x direction (left side in the figure), and from this figure, the phase of the rotational motion and the phase of the light quantity fluctuation match. (Phase difference 0
゜).

FIG. 6B shows a positional relationship shifted in the minus y direction (downward in the figure). In this case, the phase difference is 90 °, and FIG. ) Shows a positional relationship shifted in this case, and the phase difference in this case is 180 °, and FIG. 4D shows a positional relationship shifted in the positive y direction (upward in the figure), and the phase difference in this case is 270 °. You can see that.

On the other hand, FIG. 10 shows the relationship between the amplitude of light quantity fluctuation and the amount of eccentricity. As shown in FIGS. 7A to 7C, the reference connector 15a is positioned relative to the center position 200b of the core 20b in each optical fiber 15b on the optical connector 11 to be measured.
When the center of rotation of the center position 200a of the core 20a is not deviated so much, the amplitude of the fluctuation in the amount of light received by the light receiver 31 is small (in particular, the center positions match as shown in FIG. If the deviation increases, the amplitude of the light amount fluctuation also increases.

When the value exceeds a certain value (approximately 2.5 μm between single mode fibers), the amplitude becomes smaller as the deviation becomes larger. FIG. 11 shows this. In FIG. 11, when the detection level is equal to or lower than the level (specified value) indicated by the dotted line, the signal component is buried in the noise component. Either it is in the range where it is considered that the cores (the core positions match) or the center position is largely off.

The calculation of the deviation direction and the deviation amount is performed by the CPU 5 shown in FIGS. That is, the waveform of the rotational motion shown in FIGS. 8A to 8D is obtained from the sine wave generation circuit 41 of the circular motion controller 4 by the detector 3.
Is the waveform of the reference signal 35 input to the first and second phase detectors 33a, 33a,
3b shows the waveforms of the signals respectively input to FIG.

The output E _{SX of} the first phase detector 33a and the output E _SY of the second phase detector 33b are, as shown in FIG. Given θ _S, the center position 200a of the core 20a in the reference connector 15a and the center position 200b of the core 20b in the measured optical fiber 15b have a positional relationship as shown in FIG. formula (x _{side) E SX = E S · cosθ} S ··· (1) (y _{side) E SY = E S · cos} (θ S -90 _{°) = E S · sinθ S ···} (2) Is obtained by

Therefore, the CPU 5 performs the first and second A / D
The outputs E _SX and E _SY of the first and second phase detectors 33a and 33b are fetched via the converters 34a and 34b, respectively, and the eccentric direction θ and the eccentric amount d are calculated.

The calculation of the eccentric direction θ and the eccentric amount d is as follows.
Since the relationship between the amplitude of the eccentricity and the amount of light change is found that the relationship shown in FIG. 11, the eccentric direction of the real theta _S
And the eccentricity d', by adding the correction in the first operating phase with previously obtained offset information described above (error P _Y errors P _X and y direction of the x-direction are known in advance at the time of fixing), It can be obtained from the following formula.

Θ = tan ⁻¹ ((d ′ · sin θ _S −P _Y ) / (d ′ · cos θ _S −P _X ))

[0057]

(Equation 1)

Next, an optical connector core position measuring apparatus according to another embodiment of the present invention will be described with reference to FIG.

FIG. 12 (a) is a block diagram showing the configuration of an embodiment of the optical connector core position measuring device according to the fifth aspect, which is horizontally moved on a linear guide 6 having an accurate linear scale 7. An electrostrictive element 10 that supports a reference connector 15a and is controlled by the circular motion controller 4 to perform circular motion is fixed on the movable stage 9 that moves.

The stage moving means A for controlling the horizontal movement of the moving stage 9 includes a scale counter 1 for detecting an accurate position of the moving stage 9 from the scale detecting head 8.
And a moving stage controller 2 as a driving means.

Further, the position detecting means C includes the reference connector 1
A light source 14 for emitting measurement light is provided on the front end face of each optical fiber 15b fixedly arranged on the end face of the optical connector 11 to be measured via 5a. Accordingly, the detector 3 that detects the phase difference from the detected light intensity fluctuation with respect to the circular motion of the electrostrictive element 10 and the amplitude of the light intensity fluctuation is used for the optical fiber 15.
b through the reference connector 15a and the optical coupler 16,
The reflected light is detected (that is, the light emitted from the light source 14 and reflected by the rear end face of each optical fiber 15b is used for measuring the core position).

Further, the direction of eccentricity from the center of the reference connector 15a and the reference connector 15a
Although it is composed of a CPU 5 for calculating the amount of eccentricity from the center, the point that the detector 3 and the CPU 5 are provided is the same as the position detecting means B described above.

On the other hand, the optical connector 11 to be measured has the front end face of one or more optical fibers 15b fixed to the end face of the optical connector 11 to be measured at a predetermined pitch. At least two guide pin holes 12 for determining the position of the guide pin are provided.

A dummy pipe 13 having a through hole at the center is inserted into the guide pin hole 12, and the optical fiber 1 for specifying the center position is further inserted into the through hole.
5b is inserted.

In particular, the position detecting means C and the circular motion controller 4 emit the measuring light from the light source 14 via the reference connector 15a and also detect the reflected light via the reference connector 15a. The configuration is the same as that of the position detecting means B and the circular motion controller 4 shown in FIG. 2 except that the optical coupler 16 (shown by a 3 dB coupler in the drawing) is provided.

That is, the measuring light transmitted from the reference connector 15a (optical fiber) in the detector 3 is
1 and amplifies this detection signal by an amplifier 32, and then in the first and second phase detectors 33a and 33b, respectively, the phase in the x direction and the phase in the y direction (the phase of the detected light intensity fluctuation of the measurement light). Has been detected. The detected signal is converted into a digital signal by the first and second A / D converters 34a and 34b, and is used as a calculation parameter by the CPU 5.
Sent to

The CPU 5 calculates the eccentric direction from the center of the reference connector 15a by calculating the phase difference between the circular motion and the light quantity fluctuation from the output sent from the detector 3, and calculates the reference connector 15a from the amplitude of the light quantity fluctuation. Calculate the amount of eccentricity from the center.

In the circular motion controller 4, sin
X for circular motion output from the wave generation circuit 41,
The circular motion control unit 42 controls the circular motion of the electrostrictive element 10 by the sin wave in each of the y directions, and the xy control unit 43 controls the electrostrictive element 1 according to the instruction of the CPU 5.
A voltage for finely moving 0 in the X-axis or Y-axis direction is supplied.

Next, the operation will be described. In the optical connector core position measuring device according to the fifth aspect, in the configuration of the optical connector core position measuring device according to the first aspect, the installation position of the light source is fixed to the end face of the optical connector 11 to be measured. The feature is that the optical fiber 15b is changed to the reference connector 15a side instead of the rear end face side.

This is because, as shown in FIG. 12B, the reflectance of the measurement light at the rear end face of each optical fiber 15b (indicated by the symbol D in FIG. 12A) is substantially constant (3.5%). ), The measurement light is not used directly for the core position measurement, but the core position measurement can also be performed by using the reflected light.

Accordingly, in the first operation stage, the operation of obtaining the relative position between the linear guide 6 and the end face of the optical connector 11 to be measured, the operation of making the reference connector 15a make a circular motion, and the operation of C
The calculation operation and the like in the PU 5 are the same as in the above-described embodiment.

[0072]

As described above, according to the present invention, the linear guide for horizontally moving the reference connector is disposed in parallel with the end face of the optical connector to be measured, and this reference connector is arranged at a previously designed arrangement pitch. By moving it, the reference connector is sequentially opposed to each optical fiber formed on the end face of the optical connector to be measured, and penetrated through the guide pin hole of the optical connector to be measured to correct the relative positional relationship. Either insert a dummy pipe having a hole in the center part to allow the measurement light to pass through the center of the guide pin hole, or insert an optical fiber into the through hole of this dummy pipe and insert the measurement light or reflected light into the center of the guide pin hole. To determine the center of the guide pin hole, and to specify the relative positional relationship between the end surface of the optical connector to be measured and the movement position of the reference connector. It leads to an advantage of being able to measure the deviation between the design position of the core position of the optical fibers of the fixedly arranged on the optical connector end face to be measured accurately.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of an optical connector core position measuring device according to claim 1;

FIG. 2 is a block diagram showing a configuration of a position detecting means in one embodiment of the optical connector core position measuring device according to the first embodiment.

FIG. 3 is a diagram for explaining a positional relationship between optical fibers fixedly arranged on a reference connector and a connector under measurement.

FIG. 4 is a diagram illustrating a method for detecting the center position of a guide pin hole in an optical connector to be measured.

FIG. 5 is a perspective view and a sectional view showing a configuration of an electrostrictive element according to the present invention.

FIG. 6 is a diagram for explaining the operation of the electrostrictive element according to the present invention.

FIG. 7 is a diagram for explaining the circular motion of the electrostrictive element according to the present invention based on the positional relationship between optical fibers fixedly arranged on the reference connector and the connector under test.

FIG. 8 is a diagram showing the relationship between the amplitude of the measurement light and the amount of positional deviation due to the positional relationship between the optical fibers fixedly arranged on the reference connector and the connector under measurement in the present invention.

FIG. 9 is a diagram showing the relationship between the amplitude of the measurement light and the amount of positional deviation due to the positional relationship between the optical fibers fixedly arranged on the reference connector and the connector under measurement according to the present invention.

FIG. 10 is a diagram showing the relationship between the phase difference of the measurement light and the direction of the positional shift with respect to the circular motion due to the positional relationship between the optical fibers fixedly arranged on the reference connector and the connector under measurement in the present invention.

FIG. 11 is a diagram for explaining a method of calculating the direction and amount of displacement of the position detecting means according to the present invention.

FIG. 12 is a block diagram showing a configuration of an embodiment of an optical connector core position measuring device according to claim 5;

FIG. 13 is a perspective view showing a conventional optical connector core position measuring device.

[Explanation of Signs] 1 ... Scale counter, 2 ... Moving stage controller, 3 ... Detector, 4 ... Circular motion controller, 5 ... CP
U, 6: Linear guide, 7: Linear scale, 8: Linear scale detection head, 9: Moving stage, 10: Electrostrictive element, 11: Connector to be measured, 12: Guide pin hole, 1
3 ... Dummy pipe, 14 ... Light source, 15a ... Reference connector, 15b ... Optical fiber, A ... Stage moving means, B,
C: Position detecting means.

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Shinji Nagasawa 1-6-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (56) References JP 4-190306 (JP, A) JP Hei 4-362906 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) G02B 6/24-6/38

Claims (10)

(57) [Claims] 1. A light source for emitting measurement light to a rear end face of an optical fiber having a front end face fixedly arranged at a predetermined pitch on an end face of an optical connector to be measured, and a light source facing one of the optical fibers. An electrostrictive element that supports a reference connector is fixed, and a moving stage that horizontally moves on a linear guide that is installed in parallel to an end face of the optical connector to be measured, and wherein the reference connector is used for the measurement. A stage moving means for moving the moving stage to move at a design pitch of an optical fiber fixedly arranged on an end face of the optical connector; a circular motion controller for controlling a circular motion of an electrostrictive element supporting the reference connector; Regarding the core position of the connector and the optical fiber fixedly arranged on the end face of the optical connector to be measured, the light is emitted from the light source, and The measuring light passing through the optical fiber is detected via the circularly moving reference connector, and the eccentric direction from the reference connector center is obtained from the phase difference between the circular movement and the light quantity fluctuation, and the amplitude of the light quantity fluctuation is obtained. An optical connector core position measuring device comprising a position detecting means for calculating an eccentric amount from a reference connector center. 2. The apparatus according to claim 1, wherein the light source emits the measurement light directly to a through hole at the center of a dummy pipe inserted into at least two guide pin holes formed in the optical connector to be measured. Item 2. An optical connector core position measuring device according to item 1. 3. The light source is inserted into a through hole at the center of a dummy pipe inserted into at least two guide pin holes formed in the optical connector to be measured, and further toward a rear end face side of the inserted optical fiber. 2. The optical connector core position measuring device according to claim 1, wherein the measuring light is emitted. 4. The position detecting means for detecting an amplitude and a phase in a light quantity fluctuation of the measuring light transmitted through an optical fiber fixedly arranged on an end face of the optical connector to be measured and propagated through a reference connector. And an eccentricity direction from the reference connector center is calculated from the phase difference between the light amount fluctuation of the measurement light detected by the detector and the circular motion, and the eccentricity amount from the reference connector center is calculated from the amplitude of the light amount fluctuation. 2. The optical connector core position measuring device according to claim 1, further comprising a CPU that performs the operation. 5. An electrostrictive element for supporting a reference connector comprising one optical fiber opposed to an optical fiber whose front end face is fixedly arranged at a predetermined pitch on an end face of an optical connector to be measured is fixed. A moving stage that moves horizontally on a linear guide that is installed in parallel to the end face of the optical connector, and that the reference connector moves at a design pitch of an optical fiber fixedly arranged on the end face of the optical connector to be measured. A stage moving means for moving the moving stage, a circular motion controller for controlling a circular motion of the electrostrictive element supporting the reference connector, and an optical fiber fixedly arranged on an end face of the reference connector and the optical connector to be measured. With respect to the core position, the measurement light is emitted to the front end face of the optical fiber on the optical connector side to be measured through the circularly moving reference connector. The reflected light reflected by the rear end face of the optical fiber is detected through the reference connector, and the eccentric direction from the center of the reference connector is obtained from the phase difference between the circular motion and the change in the amount of light. A core position measuring device for an optical connector, comprising a position detecting means for obtaining an amount of eccentricity from the optical connector. 6. A light source that emits measurement light via a reference connector to a front end face of each optical fiber fixedly arranged on the end face of the connector under measurement, and a light source that passes through each optical fiber; A detector for detecting an amplitude and a phase in a variation in the amount of reflected light that has propagated through the reference connector; and a phase difference between the variation in the amount of reflected light detected by the detector and the circular motion from the center of the reference connector. 6. The optical connector core position measuring device according to claim 5, further comprising a CPU for determining an eccentric direction and calculating an eccentric amount from the center of the reference connector from an amplitude of a light amount variation. 7. The optical connector for measurement inserts a dummy pipe having a through hole at the center into at least two guide pin holes formed on the end surface, and inserts the dummy pipe into the through hole at the center of the dummy pipe. 6. An apparatus according to claim 5, wherein an optical fiber for reflecting the measuring light emitted from said light source is inserted. 8. The core position measurement of an optical connector according to claim 1, wherein the electrostrictive element moves a reference connector to be supported in a circular motion substantially parallel to an end face of the optical connector to be measured. apparatus. 9. The position detecting means determines in advance the eccentric direction and the amount of eccentricity with respect to the designed position of the optical fiber fixedly arranged on the end face of the optical connector to be measured, in advance of the center of the guide pin hole in the end face of the optical connector to be measured. 6. The optical connector core position measuring apparatus according to claim 1, wherein the calculation is performed by correcting the eccentricity information with the measured eccentricity information. 10. The method according to claim 1, wherein a wavelength of the measurement light emitted from the light source is longer than a cutoff wavelength of a core of the optical fiber. The optical connector core position measuring device according to claim 1.