JP2000121873A - Manufacture of molding die for ferrule - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily manufacture a molding die for a ferrule for forming an optical connector with excellent transmission characteristics. SOLUTION: In this manufacturing method, a pin slider part 3 having array hole molding pin 5 for forming fiber array holes of a ferrule and guide hole molding pins 6 for forming guide pin insertion holes are arranged on a ferrule front-end surface molding side, and a pipe slider part 4 having pin receiving pipes 10 into which the tips of the array hole molding pins 5 are inserted is arranged on a ferrule read-end surface molding side. The surface shapes of the array hole molding pins 5 and guide hole molding pins 6 are measured from one side of the array surface of the array hole molding pins 5 without contacting, the quantity of eccentricity of the array from with the guide hole molding pins 6 is found from the measured surface shapes, and the eccentricity is corrected on the basis of the found eccentricity quantity, thereby manufacturing the objective molding die.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a ferrule molding die for manufacturing an optical connector ferrule.

[0002]

2. Description of the Related Art As a general ferrule for an optical connector, a ferrule 100 as shown in FIG. 9 is known, and an optical connector C is formed by the ferrule 100. The optical connector C shown in FIG. 9 is a so-called MT connector. Ferrule 1
Reference numeral 00 denotes an optical connector C which is formed of a synthetic resin and is attached to an end of the optical fiber core F. Joint end face (front end face) 101 with mating optical connector C
The end of the fiber arrangement hole 103 for arranging the optical fibers in the optical fiber core F is opened. Further, a pair of guide pin insertion holes 102 for inserting the guide pins P made of stainless steel are also opened in the joint end face 101. The above-described optical connector C has a guide pin insertion hole 102.
10 and a guide pin P,
And the connected state is held by the clamp spring S.

[0003] The ferrule 100 described above is manufactured using a mold as shown in FIG. The mold illustrated in FIG. 11 includes a lower mold 105, an upper mold 106, and a pin slider unit 107. Pin slider part 107
Are slidably disposed on the molding side of the rear end face of the ferrule 100 to be molded.
6 have four arrangement hole forming pins 108 and a pair of guide hole forming pins 109. The fiber array hole 103 is formed by the array hole forming pin 108,
The guide pin forming hole 109 of the ferrule 100 is formed by the guide hole forming pin 109. The arrangement hole forming pin 108 and the guide hole forming pin 109 are
Positioning is performed by the V-grooves 110 and 111 formed at 05.

The connection between optical fibers by the optical connector C needs to be performed with extremely high precision. The cross-sectional diameter of the optical fiber is about 0.125 mm, and a portion called a core that actually transmits light is located at the center of the cross-section of the optical fiber. The optical connector C has a very high accuracy (with submicron order accuracy) between these cores.
It must be abutting. That is, since the optical fibers in the optical connector C are aligned with each other by the guide pin P and the guide pin insertion hole 102, the position of the fiber arrangement hole 103 with respect to the guide pin insertion hole 102 is
It must be aligned with very high precision.

[0005]

However, when the above-described mold is used, the positions of the arrangement hole forming pin 108 and the guide hole forming pin 109 for forming the guide pin insertion hole 102 and the fiber arrangement hole 103 are shown in FIG. As shown in FIG. 12, the position is fixed by the V-grooves 110 and 111 only when the lower mold 105 and the upper mold 106 are closed. Therefore, the lower mold 105 and the upper mold 10
6. Even if the position of the arrangement hole forming pin 108 which is not fixed by 6 is measured, the exact (submicron-order accurate) position of the fiber arrangement hole 103 with respect to the guide pin insertion hole 102 in the formed ferrule 100 is known. Could not.

Therefore, conventionally, the measurement of the mold itself and the measurement of the test-formed ferrule 100 are performed, and the measurement results are taken into consideration in consideration of the coefficient of thermal expansion of the mold and the amount of plastic deformation of the mold due to the clamping force. Thus, the mold is adjusted based on the prediction that the position of the fiber array hole 103 with respect to the guide pin insertion hole 102 is in a desired state. This process may have to be repeated several times until the ferrule 100 in which the position of the fiber arrangement hole 103 with respect to the guide pin insertion hole 102 is in a desired state can be formed. Was troublesome. The method of measuring the ferrule after molding is described in, for example,
No. 75.

Further, it is very difficult to make the position of the fiber arrangement hole 103 with respect to the guide pin insertion hole 102 a sufficiently satisfactory desired state only by such adjustment based on measurement and prediction. Further, when the mold needs to be replaced due to the consumption of the mold or the like, such work is required for each replacement, which has been a major obstacle in improving the production efficiency.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method of manufacturing a ferrule-forming mold capable of easily manufacturing a ferrule-forming mold for forming an optical connector having good transmission characteristics. .

[0009]

According to a first aspect of the present invention, there is provided a ferrule for an optical connector, comprising a plurality of pins for forming a fiber arrangement hole and a pair of guide holes for forming a guide pin insertion hole for the ferrule. A pin slider portion having a forming pin is disposed on the front end surface forming side of the ferrule, and a pipe slider portion having a plurality of parallel pin receiving pipes into which the tips of the arrayed hole forming pins are inserted is formed on the rear end surface forming side of the ferrule. A method for manufacturing a ferrule forming die for manufacturing a disposed forming die, wherein the surface shapes of the arrangement hole forming pin and the guide hole forming pin are not contacted from one side of the arrangement surface of the arrangement hole forming pin. Measure, from the measured surface shape of the arrangement hole forming pin and the guide hole forming pin,
The eccentricity of the arrayed hole forming pin with respect to the guide hole forming pin is obtained, and the eccentricity of the arrayed hole forming pin with respect to the guide hole forming pin is corrected based on the obtained eccentricity to manufacture a molding die. And

According to a second aspect of the present invention, in the first aspect of the present invention, the surface shapes of the arrangement hole forming pin and the guide hole forming pin are set so that the surface shapes of the arrangement hole forming pin and the guide hole forming pin extend in the length direction of the arrangement hole forming pin. From the surface shape of the arrangement hole forming pin and the guide hole forming pin measured by contact measurement, in addition to the amount of eccentricity of the arrangement hole forming pin with respect to the guide hole forming pin, the bending amount of the arrangement hole forming pin is also obtained and obtained. The eccentricity of the arrangement hole forming pin with respect to the guide hole forming pin and the bending of the arrangement hole forming pin are corrected based on the eccentric amount and the bending amount.

[0011] The invention described in claim 3 is the invention according to claim 1 or 2.
In the invention described in the above, by using an image processing apparatus, the measured cross-sectional shape of the arrangement hole forming pin and the guide hole forming pin, fitting the circular cross-sectional shape of the arrangement hole forming pin and the guide hole forming pin, respectively, The center of the arrangement hole forming pin and the guide hole forming pin is estimated from the circular cross-sectional shape, and the amount of eccentricity of the arrangement hole forming pin with respect to the guide hole forming pin is determined from each of the estimated centers.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the arrangement hole forming pins are arranged in a matrix of a plurality of rows and a plurality of columns on the pin slider portion. When measuring the surface shape of the arrayed hole forming pin, after mounting the arrayed hole forming pin only on the row farthest from the above-mentioned one side and measuring the surface shape, sequentially, the arrayed hole forming pin is lined one by one on the aforementioned side. And the surface shape is measured.

The invention according to claim 5 has a plurality of parallel arrangement hole forming pins for forming the fiber arrangement holes of the ferrule for an optical connector and a pair of guide hole formation pins for forming the guide pin insertion holes of the ferrule. The pin slider part is arranged on the front end face molding side of the ferrule, and
A method for manufacturing a ferrule-forming die for manufacturing a forming die in which a pipe slider portion having a plurality of parallel pin receiving pipes into which the tips of the arrayed hole forming pins are inserted is disposed on the rear end surface forming side of the ferrule. Then, the surface shapes of the arrangement hole forming pin and the guide hole forming pin are measured in a non-contact manner from the extension direction of the arrangement hole forming pin, and the guide hole forming is determined from the measured surface shapes of the arrangement hole forming pin and the guide hole forming pin. The eccentricity of the arrangement hole forming pin with respect to the pin is obtained, and the eccentricity of the arrangement hole forming pin with respect to the guide hole forming pin is corrected based on the obtained eccentricity to manufacture a molding die.

Further, the invention according to claim 6 has a plurality of parallel arrangement hole forming pins for forming the fiber arrangement holes of the ferrule for an optical connector and a pair of guide hole forming pins for forming the guide pin insertion holes of the ferrule. The pin slider portion is disposed on the rear end surface molding side of the ferrule, has a mold portion having a pin insertion hole for inserting the tip of the array hole forming pin, and the array hole forming pin has a plurality of rows × a plurality of columns on the pin slider portion. A ferrule molding die manufacturing method for manufacturing a molding die in which the pin insertion holes are arranged in a matrix of a plurality of rows × a plurality of columns on the mold portion, Attach the array hole forming pin only to the row farthest from one side of the array hole forming pin, and insert the tip of the array hole forming pin into the pin insertion hole. Sa In this state, the surface shape is measured in a non-contact manner from one side described above, and the amount of eccentricity of the arrangement hole forming pin with respect to the guide hole forming pin is determined from the measured surface shape of the arrangement hole forming pin, and the obtained eccentric amount Correct the eccentricity of the arrangement hole forming pin with respect to the guide hole forming pin based on The eccentricity of the arrangement hole forming pin is determined, the eccentricity of the arrangement hole forming pin with respect to the guide hole forming pin is corrected, and a molding die is manufactured.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a first embodiment of a method for manufacturing a ferrule molding die according to claim 1 will be described with reference to the drawings.

FIG. 1 shows a mold for manufacturing a ferrule manufactured by the manufacturing method of the present embodiment. The ferrule 100 shown in FIG. 9 by the mold shown in FIG.
Is molded. In addition, each part of the mold shown in FIG. 1 is deformed for the sake of explanation. For example, the arrangement hole forming pin 5 for forming the fiber arrangement hole 103 of the ferrule 100 has a sectional diameter of about 0.125 mm, and the guide hole forming pin 6 for forming the guide pin insertion hole 102 has a sectional diameter of about 0.125 mm. It is about 0.7mm.

The molding die shown in FIG. 1 has a lower die 1, an upper die 2, a pin slider portion 3, and a pipe slider portion 4. The pin slider portion 3 is slidably disposed on the front end surface forming side of the ferrule 100 formed by the mold. The pipe slider portion 4 is slidably disposed on the rear end surface forming side of the ferrule 100 formed by the die.

On the inner surfaces of the lower mold 1 and the upper mold 2, a concave portion 15 (the upper mold 2 side is not shown) for forming a cavity for forming the ferrule 100 is formed. In the lower mold 1, a convex portion 16 for forming an opening 104 for injecting an adhesive into the ferrule 100 is formed in a concave portion 15. Further, square cutouts 17 (the upper mold 2 side is not shown) for inserting the square part 11 are formed in the lower mold 1 and the upper mold 2 on the pipe slider section 4 side. A pair of round grooves 18 (on the side of the upper mold 2) through which a pin receiving pipe 12 into which the tip of the guide hole forming pin 6 is inserted is inserted into the lower mold 1 and the upper mold 2 on the side of the pipe slider section 4. Are not shown).

The pin slider portion 3 has a first member 3a and a second member 3b. The first member 3a and the second member 3b form four arrangement hole forming pins 5 and a pair of guide hole forming pins 6. Is sandwiched. The arrangement hole forming pin 5 is
The base end is housed in a V-shaped groove 7 formed in parallel with the upper surface of a, and is pressed into the V-shaped groove 7 by the lower surface of the second member 3b to be accurately positioned.

The guide hole forming pin 6 is
Are arranged so as to be parallel to the arrangement hole forming pins 5. The base end of the guide hole forming pin 6 is housed in a V groove 8 formed parallel to the upper surface of the first member 3a,
It is pressed into the V-groove 8 by the concave portion 9 formed on the lower surface of the second member 3b, and is accurately positioned. The distal ends of the arrangement hole forming pin 5 and the guide hole forming pin 6 are tapered so as to be easily inserted into receiving pipes 10 and 12 described later.
reference).

The pipe slider portion 4 has a third member 4a and a fourth member 4b, and the rectangular portion 11 and the pin receiving pipe 12 are sandwiched between the third member 4a and the fourth member 4b. The square portion 11 has its base end fixed between the third member 4a and the fourth member 4b, and four pin receiving pipes 10 for receiving the front ends of the arrangement hole forming pins 5 are provided at the front end thereof. ing. The pin receiving pipes 12 are disposed on both sides of the rectangular portion 11, and the base ends thereof are housed in V-shaped grooves 13 formed in parallel with the upper surface of the third member 4 a, and the fourth members 4.
It is accurately positioned by being pressed into the V-groove 13 by the concave portion 14 formed on the lower surface of b.

The pin receiving pipes 10, 12
It is sufficient that the tip of the pin can receive the tip of the arrangement hole forming pin 5 or the guide hole forming pin 6 and does not necessarily have to be hollow over its entire length. That is, these pin receiving pipes 10 and 12 only need to have recesses at their tip end portions that can receive the tip ends of the arrangement hole forming pin 5 and the guide hole forming pin 6.

At the time of manufacturing the mold, each component is assembled so as to have the above-described configuration. Before final completion, the position of the arrayed hole forming pin 5 with respect to the guide hole forming pin 6 is accurately adjusted. There is a process. As described above, in the ferrule 100 after molding, the fiber array holes 10
3 needs to be positioned with high precision with respect to the guide pin insertion hole 102. For this purpose, the position of the arrangement hole forming pin 5 with respect to the guide hole forming pin 6 is accurately adjusted.

In order to adjust the position of the arrangement hole forming pin 5 with respect to the guide hole forming pin 6, first, as shown in FIG. Non-contact measurement is performed from one side of the arrangement surface (XZ plane) of the molding pins 5. At this time, the surface shapes of the arrangement hole forming pin 5 and the guide hole formation pin 6 are, as indicated by arrows in FIG. 2, the arrangement direction (X direction) of the arrangement hole formation pin 5 perpendicular to the arrangement hole formation pin 5. To be measured.

For the non-contact measurement method, a laser microscope which is a three-dimensional surface structure analysis microscope is used here.
By using a laser microscope, the surface shapes of the arrangement hole forming pin 5 and the guide hole forming pin 6 can be three-dimensionally measured. FIG. 3 shows an example of the measurement result. In addition,
As a non-contact measurement method, there is a method using a scanning white interferometer, an optical image processing microscope, or the like, in addition to a method using a laser microscope.

The results of measurement by a laser microscope are shown by Q ₁₀ and Q ₂₀ (solid lines) in FIG. Arrangement hole forming pin 5
Are measured only from one side of the arrangement plane (XZ plane), the surface shapes of the arrangement hole forming pin 5 and the guide hole forming pin 6 are each measured as a semicircle. Therefore, here, the circular cross-sectional shape of the arrangement hole forming pin 5 and the circular cross-sectional shape of the guide hole forming pin 6 are fitted to each semicircle using the least square method. The fitted circular cross sections are indicated by Q ₁₁ and Q ₂₁ (dotted lines) in FIG. For each circular cross-sectional shape of the arrangement hole forming pin 5 and the guide hole forming pin 6, since the respective cross-sectional radii are known in advance, those prepared in advance are fitted.

As a result, the centers O ₁ and O ₂ of the fitted circles can be regarded as the centers of the arrangement hole forming pins 5 and the guide hole forming pins 6, and the guide hole forming pins are determined from the centers O ₁ and O _2. The amount of eccentricity of the arrangement hole forming pin 5 with respect to 6 can be obtained. Based on the obtained eccentricity, the mold is adjusted so that the position of the arrangement hole forming pin 5 with respect to the guide hole forming pin 6 is in a desired state. Here, it is the optimal state that all the centers are on a straight line, the four centers O ₁ are arranged at a predetermined interval, and the distance between the centers O ₁ and O ₂ is a predetermined distance.

After such adjustment, a mold is manufactured. According to the manufacturing method described above, it is necessary to consider the resin shrinkage after molding, the coefficient of thermal expansion of the mold, the amount of plastic deformation of the mold due to the mold clamping force, and the like. Without performing the process, it is possible to easily manufacture a precisely adjusted mold.

As shown in FIGS. 9 and 10, the joining end faces 101 of the ferrule 100 manufactured by the above-described mold are brought into contact with each other to connect the internal optical fibers. For this reason, the position of the fiber arrangement hole 103 is particularly important at the opening position at the joint end face 101. This is because the amount of axial deviation of the optical fiber to be connected changes depending on the position of the opening on the bonding end face 101.

In the above-described mold, the bonding end face 101 side of the fiber arrangement hole 103 corresponds to the base end side of the arrangement hole forming pin 5. Here, since the base end side of the arrangement hole forming pin 5 is sandwiched by the pin slider portion 3, the eccentric variation itself of the base end portion of the arrangement hole forming pin 5 can be reduced. Further, since the base end side of the arrangement hole forming pin 5 is sandwiched by the pin slider portion 3, by measuring the surface shapes of the arrangement hole forming pin 5 and the guide hole forming pin 6 in the state shown in FIG. The position of the fiber arrangement hole 103 with respect to the guide pin insertion hole 102 in the molded ferrule 100 can be accurately predicted.

On the other hand, in the conventional mold shown in FIG.
The side corresponds to the tip side of the array hole forming pin 108, and the tip side is fixed in its position only when the lower mold 105 and the upper mold 106 are closed. Therefore, not only is the eccentric variation of the tip end of the arrangement hole forming pin 108 itself large, but also the position of the arrangement hole forming pin 108 that is not fixed by the lower mold 105 and the upper mold 106 is measured. Guide pin insertion hole 10 in ferrule
It was not possible to know the exact (submicron order) position of the fiber array hole 103 with respect to 2.

The bending of the fiber arrangement hole 103, that is, the bending of the arrangement hole forming pin 5 is also determined by the ferrule 1 after molding.
The characteristics of the optical connector C using “00” are affected. This is because if the fiber array hole 103 is bent, the emission and incidence directions of light change, so that the loss at the connection portion is affected. Further, in the optical connector C shown in FIG. 9, after the optical fiber is fixed inside the fiber array hole 103 of the ferrule 100, the joint end face of the ferrule 100 may be polished in order to reduce the connection loss. Also in this case, if the arrangement hole forming pin 5 is bent, the fiber arrangement hole 103 also bends, so that the eccentric amount of the fiber arrangement hole 103 with respect to the guide pin insertion hole 102 may be increased by polishing.

For this reason, in the manufacturing method of this embodiment, in addition to the eccentricity of the arrangement hole forming pin 5 with respect to the guide hole forming pin 6, the arrangement hole forming pin 5 is formed by the following method.
Is also measured, and the bending of the arrayed hole forming pin 5 is adjusted based on the measurement result.

In order to measure the amount of bending of the arrangement hole forming pin 5, the measurement shown in FIG.
It is determined by measuring over the length direction. The measurement in the length direction of the arrangement hole forming pin 5 may be performed on at least two cross sections, and it is preferable to measure several cross sections at a predetermined pitch.

By fitting a circle to the surface shape measured for each measured cross section to determine the center and arranging the centers continuously, the amount of bending of the arrayed hole forming pin 5 can be determined. Based on the obtained bending amount, the mold is adjusted so that the bending of the arrangement hole forming pin 5 is in a desired state. Here, the mold is manufactured through such adjustment.

When the ferrule 100 shown in FIG. 9 is formed by the above-described mold, the lower mold 1 and the upper mold 2 are closed, and the pin slider 3 and the pipe slider 4 are moved toward each other. By sliding, the arrangement hole forming pin 5 and the guide hole forming pin 6 are placed inside the lower mold 1 and the upper mold 2.
And are arranged. At this time, the tip of the arrangement hole forming pin 5 is inserted into the pin receiving pipe 10 and positioned. The tip of the guide hole forming pin 6 is inserted into the pin receiving pipe 12 and positioned. The square part 11 is introduced into the lower mold 1 and the upper mold 2 via the square notch 17, and the lower surface thereof is in surface contact with the upper surface of the convex part 16.

Next, the lower mold 1 is moved from a gate (not shown) to the lower mold 1.
Then, the inside of the upper mold 2 is filled with a molten resin, and then the resin is cooled and solidified. The fiber arrangement holes 103 are formed by the arrangement hole forming pins 5, and the guide pin insertion holes 102 are formed by the guide hole formation pins 6. Also, the convex portion 1
The opening 104 for filling the adhesive and the insertion hole for inserting the optical fiber core are formed by the square part 6 and the square part 11.

When the resin inside the lower mold 1 and the upper mold 2 is solidified, the pin slider portion 3 and the pipe slider portion 4 are slid to the side to pull out the arrangement hole forming pin 5 and the guide hole forming pin 6, etc. Next, the lower mold 1 and the upper mold 2 are opened, and the formed ferrule 100 is taken out. According to the above-described mold, the ferrule 10 in which the fiber array hole 103 is accurately positioned with respect to the guide pin insertion hole 102.
0 can be easily manufactured.

Next, a second embodiment of the method for manufacturing a ferrule molding die according to the present invention will be described with reference to the drawings.

The mold manufactured by the manufacturing method of this embodiment is for molding a ferrule 100 as shown in FIG. With the recent increase in traffic,
Optical components are being densified and highly integrated. The ferrule 100 shown in FIG. 4 also has fiber array holes 103 formed in a matrix for such densification and high integration. . In order to form the optical connector C using such a ferrule 100, one tape-shaped optical fiber core F corresponding to each row is laminated and used. Also in this optical connector C, the guide pin insertion hole 102
Positioning with respect to the optical connector C of the other party to be connected is performed.

The main difference between the manufacturing method of the present embodiment and the first embodiment is that the number of the arrangement hole forming pins 5 is different. FIG. 4 shows the fiber array holes 10.
3 is formed in a matrix of 4 rows × 12 columns,
Hereinafter, a description will be given of a mold in which the arrangement hole forming pins 5 for forming the fiber arrangement holes 103 are arranged in 4 rows × 4 columns. Also, the mold shown in FIG. 5 also shows each part deformed for explanation.

The molding die shown in FIG.
, An upper mold 22, a pin slider section 23, and a pipe slider section 24. The lower mold 21 and the upper mold 22 have substantially the same configuration as the lower mold 1 and the upper mold 2 shown in FIG. The lower mold 21 and the upper mold 22 are provided with a concave portion 35 forming a cavity (the upper mold 22 side is not shown),
Convex part 1 for forming opening 104 for injecting adhesive
6 (only the lower mold 21 side) and a square notch 37 (the upper mold 2) through which the square 31 of the pipe slider 24 is inserted.
2 are not shown). Also, lower mold 2
A pair of V-grooves 38 for positioning the tip of the guide hole forming pin 26 is provided on the pipe slider portion 24 side of the upper mold 22 and the upper mold 22.
Is also formed.

The pin slider portion 23 is provided with the arrangement hole forming pin 2.
5 has a pin insertion hole 27 for inserting / fixing, and a pair of pin insertion holes 28 for inserting / fixing the guide hole forming pin 26. The pin insertion holes 27 are formed in a matrix, and the arrangement hole forming pins 25 are arranged in a matrix. Flanges 25a and 26a are formed at the most proximal ends of the arrayed hole forming pin 25 and the guide hole forming pin 26 inserted and fixed in the pin insertion holes 27 and 28, respectively. Flange 25
Positioning is performed in the length direction of the arrangement hole forming pin 25 and the guide hole forming pin 26 by the a and 26a. The arrangement hole forming pin 25 and the guide hole forming pin 26 are accurately positioned by being inserted and fixed in pin insertion holes 27 and 28 which are accurately drilled.

The pipe slider portion 24 has a rectangular portion 31 protruding from one surface side thereof.
6 is formed with an insertion hole 32 into which the tip of the insertion hole 6 is inserted. Pin receiving pipes 30 for receiving the tips of the arrayed hole forming pins 25 are arranged in a matrix at the tip of the square part 31. The tip of the pin receiving pipe 30 is formed in a tapered shape, and a hole for inserting the arrayed hole forming pin 25 is formed at the tip end thereof. Note that the pin receiving pipe 30 does not necessarily have to be hollow over its entire length.
This is similar to the case of the mold shown in FIG.

At the time of manufacturing the mold, the components are assembled so as to have the above-described configuration. Before the final completion, as in the first embodiment, the arrangement hole forming pin with respect to the guide hole forming pin 26 is formed. There is a step of precisely adjusting the position of 25. In order to adjust the position of the arrangement hole forming pin 25 with respect to the guide hole forming pin 26, the surface shape of the arrangement hole forming pin 25 is measured as in the first embodiment. Is an array hole forming pin 25
Is inserted and fixed in the pin insertion hole 27 in parallel.

The surface shapes of the arrangement hole forming pins 25 and the guide hole forming pins 26 are measured in a non-contact manner from one side of the arrangement surface (XZ plane) of the arrangement hole forming pins 25, as in the first embodiment. Here, the arrangement surface of the arrangement hole forming pins 25 arranged in a matrix is a surface (XZ plane) on which a pair of guide hole formation pins 26 are arranged. First, the arrangement hole forming pin 25 is inserted and fixed only in the pin insertion hole 27 in the row farthest from one side of the arrangement surface (XZ plane) of the arrangement hole forming pin 25, and the pair of guide hole forming pins 26 are inserted. It is inserted and fixed in the pin insertion hole 28.

Next, the surface shapes of the arrangement hole forming pin 25 and the guide hole forming pin 26 are measured in a non-contact manner from one side of the arrangement surface (XZ plane) of the arrangement hole forming pin 25. At this time, the surface shapes of the arrangement hole forming pin 25 and the guide hole formation pin 26 are in the arrangement direction (X direction) of the arrangement hole formation pin 25 inserted and fixed in the pin insertion hole 27, as in the first embodiment. Measure. Here, a laser microscope is used for the non-contact measurement method.

The method of obtaining the amount of eccentricity of the arrayed hole forming pin 25 with respect to the guide hole forming pin 26 from the measurement result by the laser microscope is exactly the same as the method of the first embodiment described above. The surface shapes of the arrangement hole forming pin 25 and the guide hole forming pin 26 measured as a semicircle are fitted with the respective circular cross-sectional shapes, and from the center of the fitted circle, the arrangement hole forming pin 25 for the guide hole forming pin 26 is fitted. Is adjusted based on the eccentricity of the mold so that the position of the arrangement hole forming pin 25 with respect to the guide hole forming pin 26 becomes a desired state.

Arrangement surface (XZ plane) of arrangement hole forming pins 25
When the adjustment for the row farthest from one side is completed, the arrangement hole forming pin 25 is inserted and fixed in the next row, and the above-described measurement and adjustment are performed in the same manner. In this way, the measurement and adjustment are sequentially performed for each row, and the positions of all the arrangement hole forming pins 25 arranged in a matrix are accurately adjusted.

In the mold used in the manufacturing method of this embodiment, the arrangement hole forming pin 25 and the guide hole forming pin 2
By measuring the surface shape of the ferrule 1 after molding,
The position of the fiber arrangement hole 103 with respect to the guide pin insertion hole 102 at 00 can be accurately predicted.

When measuring the surface shapes of the arrangement hole forming pin 25 and the guide hole forming pin 26, the arrangement hole forming pin 25
By measuring over the length direction, the bending amount of the arrangement hole forming pin 25 is also measured, and based on the amount of bending, the die is adjusted so that the bending of the arrangement hole forming pin 25 is in a desired state. This can be performed in the same manner as in the first embodiment.

When the ferrule 100 in which the fiber arrangement holes 103 are formed in a matrix as shown in FIG. 4 is formed by the above-described mold, the lower mold 21, the upper mold 22, the pin slider portion 23, The pipe slider portion 24 is closed, and the arrangement hole forming pin 25 and the guide hole forming pin 26 are arranged inside the lower mold 21 and the upper mold 22. At this time, the tip of the arrangement hole forming pin 25 is inserted into the pin receiving pipe 30 and positioned. The tip of the guide hole forming pin 26 is inserted into the insertion hole 32 after being positioned by the V groove 38. The lower surface of the rectangular portion 31 is in surface contact with the upper surface of the convex portion 36.

In this state, if the molten resin is injected and then solidified, the ferrule 100 in which the fiber arrangement hole 103 is accurately positioned with respect to the guide pin insertion hole 102 can be easily manufactured.

Next, an embodiment of a method for manufacturing a ferrule molding die according to claim 5 will be described with reference to the drawings.

The mold for manufacturing a ferrule manufactured by the manufacturing method of the present embodiment is the same as the mold shown in FIG. 1, and the description of the structure of the mold will be omitted. The manufacturing method according to the present embodiment is different from the first embodiment according to claim 1 in that the arrangement hole forming pin in the step of accurately adjusting the position of the arrangement hole forming pin 5 with respect to the guide hole forming pin 6 is described. The method for measuring the surface shapes of the pin 5 and the guide hole forming pin 6 is different. Therefore, only this step will be described below.

In this embodiment, first, as shown in FIG. 6, the arrangement hole forming pin 5 and the guide hole forming pin 6
The surface shape of the pin in the extending direction of the arrangement hole forming pin 5 (Z direction)
Non-contact measurement from. For the non-contact measurement method, a scanning white microscope is used here.

FIG. 7 shows the results of measurement by a scanning white microscope.
Is shown in Since the measurement is performed from the extension direction (Z direction) of the arrangement hole forming pin 5, the surface shapes of the arrangement hole forming pin 5 and the guide hole forming pin 6 are circular as shown by Q ₃ and Q ₄ in FIG. Measured. Then, using the least squares method, obtaining the center O _3, O ₄ of the circle Q _3, Q _4. This center O
₃ and O ₄ can be regarded as the centers of the arrangement hole forming pin 5 and the guide hole forming pin 6, and the eccentricity of the arrangement hole forming pin 5 with respect to the guide hole forming pin 6 is determined from the centers O ₃ and O _4. Can be.

Based on the obtained eccentricity, the die is adjusted so that the position of the arrangement hole forming pin 5 with respect to the guide hole forming pin 6 is in a desired state. According to this method, the measurement can be performed very easily as compared with the first embodiment of the manufacturing method according to the first aspect. In particular, when manufacturing a mold in which the arrayed hole forming pins 25 as shown in FIG. 5 are arranged in a matrix, the manufacturing method according to the second embodiment of the present invention is further improved. The measurement can be performed very easily.

On the other hand, depending on the manufacturing method of this embodiment,
The amount of bending of the arrangement hole forming pin 5 cannot be measured. Further, in order to measure the surface shape of the guide hole forming pin 6 not on the base end side but on the distal end side of the array hole forming pin 5, the position of the fiber array hole 103 on the joint end face 101 of the formed ferrule 100 is predicted. In such a case, accuracy may not be obtained as compared with the first and second embodiments of the manufacturing method described in claim 1. However, there is an advantage that measurement can be performed very easily as described above. In consideration of these points, the manufacturing method described in claim 1 and the manufacturing method described in claim 5 may be appropriately used. In the case of performing this manufacturing method, it is preferable to use an arrayed hole forming pin 5 having a roundness of 0.1 μm or less in cross section and good straightness.

Further, an embodiment of a method of manufacturing a ferrule molding die according to claim 6 will be described with reference to the drawings.

FIG. 8 shows a mold for manufacturing a ferrule manufactured by the manufacturing method of the present embodiment. The ferrule 100 in which the fiber array holes 103 are formed in a matrix as shown in FIG. 4 is formed by the mold shown in FIG. In FIG. 4, the fiber arrangement holes 103 are formed in a matrix of 4 rows × 12 columns. Hereinafter, four arrangement hole forming pins 45 for forming the fiber arrangement holes 103 will be described. The description will be made using a mold arranged in rows and four columns. In addition, the mold shown in FIG. 8 also shows each part deformed for explanation.

The molding die shown in FIG.
And an upper mold 42 and a pin slider portion 44. The pin slider portion 44 is slidably disposed on a rear end surface forming side of the ferrule 100 formed by the die. The lower mold 41 includes a fifth member 41a and a sixth member 41.
b (mold part). The sixth member 41 is attached to the front member forming side of the ferrule 100 in the fifth member 41a.
b is connected.

The sixth member 41b has a pin insertion hole 47 into which the tip of the arrangement hole forming pin 45 is inserted, and a pair of pin insertion holes 48 into which the tip of the guide hole forming pin 46 is inserted. The pin insertion holes 47 are formed in a matrix.
The arrangement hole forming pin 45 and the guide hole forming pin 46 are accurately positioned by inserting and fixing their tips into pin insertion holes 47 and 48 which are accurately drilled.

On the inner surfaces of the fifth member 41a and the upper mold 42, a concave portion 55 (the upper mold 42 side is not shown) for forming a cavity for forming the ferrule 100 is formed. The fifth member 41a has a ferrule 10
A convex portion 56 for forming an opening 104 into which an adhesive is injected is formed in the concave portion 55. Furthermore,
On the pin slider portion 44 side of the lower die 41 and the upper die 42, square notches 57 (the upper die 2 side is not shown) for inserting the square portion 51 are formed, respectively. Further, a V groove 58 for positioning the base end of the guide hole forming pin 46 is formed on the pin slider portion 44 side of the fifth member 41a.

The pin slider portion 44 has a rectangular portion 51 projecting from one surface thereof, and a pair of guide hole forming pins 46 for forming a guide pin insertion hole 102 projecting from both sides thereof. I have. Arrangement hole forming pins 45 are arranged in a matrix at the tip of the square portion 51.

Even during the manufacture of this mold, there is a step of accurately adjusting the position of the arrangement hole forming pin 45 with respect to the guide hole forming pin 46. In the conventional mold shown in FIG. 11, it is impossible to measure a state in which the lower mold 105 and the upper mold 106 are closed and the arrangement hole forming pin 108 is accurately positioned at the position at the time of molding. Met. However, in the mold manufactured according to the present embodiment, even when the upper mold 42 is not closed, the arrangement hole forming pin 45 is accurately positioned at the position at the time of molding, so that measurement is possible. And the adjustment can be made based on this.

In order to adjust the position of the arrangement hole forming pin 45 with respect to the guide hole forming pin 46, first, as shown in FIG. 8, the surface shape of the arrangement hole forming pin 45 is measured. This measurement is performed in parallel with fixing the alignment hole forming pin 45 to the square portion 51.

The surface shapes of the arrangement hole forming pins 45 and the guide hole formation pins 46 are measured by non-contact from one side of the arrangement surface (XZ plane) of the arrangement hole forming pins 45. Say here,
The arrangement surface of the arrangement hole forming pins 45 arranged in a matrix is
The surface on which the pair of guide hole forming pins 46 is arranged (XZ
Plane). First, the arrangement hole forming pin 45 is fixed to the square portion 51 only for the row farthest from one side of the arrangement plane (XZ plane). Thereafter, the pin slider portion 44 is slid so that the arrangement hole forming pin 45 and the guide hole forming pin 4 are moved.
6 are inserted into the pin insertion holes 47 and 48, and the arrangement hole forming pin 45 and the guide hole forming pin 46 are positioned.

Next, the surface shapes of the arrangement hole forming pins 45 and the guide hole forming pins 46 are measured in a non-contact manner from one side of the arrangement surface (XZ plane) of the arrangement hole forming pins 45. At this time, the surface shapes of the arrangement hole forming pin 45 and the guide hole formation pin 46 are measured in the arrangement direction (X direction) of the arrangement hole formation pin 45 fixed to the square portion 51 as shown by the arrow in FIG. I do. Here again, a laser microscope is used for non-contact measurement.

The method of determining the amount of eccentricity of the arrayed hole forming pin 45 with respect to the guide hole forming pin 46 from the measurement result by the laser microscope is exactly the same as the method of the first embodiment of the manufacturing method described in claim 1 described above. is there. Arrangement hole forming pin 45 and guide hole forming pin 46 measured as a semicircle
Each of the circular cross-sectional shapes is fitted to the surface shape of the guide hole forming pin 46 based on the amount of eccentricity of the arraying hole forming pin 45 with respect to the guide hole forming pin 46 from the center of the fitted circle. The mold is adjusted so that the position of 45 is in a desired state.

The arrangement surface of the arrangement hole forming pin 45 (XZ plane)
When the adjustment for the row farthest from one side is completed, the pin slider section 44 is slid and the alignment hole forming pin 4
5 and the tip of the guide hole forming pin 46 are
Remove from 48. Then, in the next row, the arrangement hole forming pin 2
5 is inserted and fixed. The pin slider portion 44 is slid, and the ends of the arrangement hole forming pin 45 and the guide hole forming pin 46 are inserted into the pin insertion holes 47 and 48, and measurement and adjustment are performed in the same manner. In this way, measurement and adjustment are sequentially performed for each row, and all the arrangement hole forming pins 45 arranged in a matrix are arranged.
Adjust the position about.

In the mold used in the manufacturing method of this embodiment, the arrangement hole forming pin 45 and the guide hole forming pin 4
By measuring the surface shape of the ferrule 1 after molding,
The position of the fiber arrangement hole 103 with respect to the guide pin insertion hole 102 at 00 can be accurately predicted.

When measuring the surface shapes of the arrangement hole forming pin 45 and the guide hole forming pin 46, the arrangement hole forming pin 45
The bending amount of the arrangement hole forming pin 45 is also measured by measuring over the length direction, and the die is adjusted based on the amount of bending so that the bending of the arrangement hole forming pin 45 is in a desired state. What can be done is the same as in the first embodiment of the manufacturing method described in claim 1 described above.

Further, the surface shapes of the arrangement hole forming pin 45 and the guide hole forming pin 46 are measured even before the tips of the arrangement hole forming pin 45 and the guide hole forming pin 46 are inserted into the pin insertion holes 47 and 48. Can also. In this way, the arrangement hole forming pin 4 with respect to the guide hole forming pin 46 is formed.
It is also possible to determine how much the amount of eccentricity of 5 occurs before and after the tips of the arrangement hole forming pin 45 and the guide hole forming pin 46 are inserted into the pin insertion holes 47 and 48.

In the above-described mold, the bonding end face 101 side of the fiber arrangement hole 103 is arranged with the arrangement hole forming pin 45.
Corresponds to the tip side of Here, the tip side of the arrangement hole forming pin 45 is inserted into the pin insertion hole 47 at the time of measurement. Therefore, the arrangement hole forming pin 45 and the guide hole forming pin 46
By measuring the surface shapes of the ferrules 100 in the state in which they are inserted into the pin insertion holes 47 and 48, the position of the fiber array hole 103 with respect to the guide pin insertion hole 102 in the formed ferrule 100 can be accurately predicted.

When the ferrule 100 in which the fiber arrangement holes 103 are formed in a matrix as shown in FIG. 4 is formed by the above-described mold, the pin slider 44 is slid, and the lower mold 41 and the upper mold 41 are moved. The mold 42 is closed, and the arrangement hole forming pin 45 and the guide hole forming pin 46 are arranged inside the lower mold 41 and the upper mold 42. At this time, the tips of the arrangement hole forming pin 45 and the guide hole forming pin 46 are inserted into the pin insertion holes 47 and 48 to be accurately positioned. The lower surface of the rectangular portion 51 is in surface contact with the upper surface of the convex portion 56.

In this state, if the molten resin is injected and then solidified, the ferrule 100 in which the fiber arrangement hole 103 is accurately positioned with respect to the guide pin insertion hole 102 can be easily manufactured.

Note that any of the above-described manufacturing methods of the present invention is not limited to the above-described embodiment. For example, the mold manufactured by the above-described manufacturing method molds a ferrule 100 for a so-called MT connector, but the molded ferrule is not limited to this. For example, a ferrule formed by a mold manufactured by this manufacturing method may be directly incorporated in an MPO connector to form a push-pull type MPO connector.

[0079]

According to the first aspect of the present invention, the die to be manufactured is disposed on the front end surface forming side of the ferrule to be molded with the pin slider portion, and the pipe slider portion is disposed on the rear end surface forming side. The arrangement of the arrangement hole forming pin and the guide hole forming pin is measured in a non-contact manner from one side of the arrangement surface of the arrangement hole forming pin. For this reason, it is possible to reduce the eccentric variation itself of the portion forming the opening end of the fiber arrangement hole, that is, the base end of the arrangement hole forming pin.

Further, the eccentricity of the fiber arrangement hole with respect to the guide pin insertion hole in the formed ferrule can be predicted with high accuracy from the measured surface shapes of the arrangement hole forming pin and the guide hole forming pin. As a result, it is not necessary to adjust the mold while actually repeating the molding of the ferrule many times, so that the mold can be easily adjusted, and a good mold can be easily manufactured.

According to the second aspect of the present invention, since the surface shapes of the arrangement hole forming pin and the guide hole forming pin are measured in a non-contact manner in the length direction of the arrangement hole forming pin, the arrangement hole forming for the guide hole forming pin is performed. In addition to the amount of eccentricity of the pin, the amount of bending of the arrangement hole forming pin can be obtained. For this reason, the eccentricity of the arrangement hole forming pin with respect to the guide hole forming pin and the bending of the arrangement hole forming pin can be corrected based on the determined eccentricity and bending amount, and the mold can be adjusted with higher accuracy. , A better mold can be easily manufactured.

According to the third aspect of the present invention, the arrangement hole forming pin and the guide are formed from the circular cross-sectional shape fitted to the measured surface shape of the arrangement hole forming pin and the guide hole forming pin using the image processing apparatus. Estimate the center of the hole forming pin. In this way, even when the surface shape is measured only from one side of the arrangement surface of the arrayed hole forming pins, the amount of eccentricity of the arrayed hole forming pin with respect to the guide hole forming pin is ( When the bending amount of the arrayed hole forming pin is also measured, the bending amount can be measured simply and with high accuracy. Further, the influence of a shape error at the time of measuring the surface shape can be suppressed. As a result,
The mold can be adjusted with high accuracy, and a better mold can be manufactured.

According to the fourth aspect of the present invention, even in the case of manufacturing a ferrule forming die for forming a ferrule having a matrix of fiber array holes, a line farthest from one side as described above. , The eccentricity of the arrayed hole forming pin with respect to the guide hole forming pin (the amount of bending of the arrayed hole forming pin, even if the arrayed hole forming pins are arranged in a matrix). When measuring also, the amount of bending can be measured simply and with high accuracy. As a result, even when manufacturing a mold in which the arrangement hole forming pins are arranged in a matrix, the mold can be adjusted with high accuracy, and a good mold can be manufactured.

According to the fifth aspect of the present invention, the mold to be manufactured is arranged with the pin slider portion on the front end surface forming side of the ferrule to be formed, and the pipe slider portion on the rear end surface forming side. The arrangement of the arrangement hole forming pin and the guide hole forming pin is measured in a non-contact manner from the extending direction of the arrangement hole forming pin. For this reason, it is easy to measure the surface shape of the arrangement hole forming pin and the guide hole forming pin,
From the measured surface shapes of the arrangement hole forming pin and the guide hole forming pin, the amount of eccentricity of the fiber arrangement hole with respect to the guide pin insertion hole in the formed ferrule can be predicted. In particular, when the arrangement hole forming pins are arranged in a matrix, the amount of eccentricity of all the arrangement hole forming pins can be obtained by one measurement, so that the measurement can be performed very easily. As a result, the mold can be adjusted very easily, and a good mold can be easily manufactured.

Further, according to the invention described in claim 6,
The die to be manufactured has a configuration in which the pin slider portion is disposed on the rear end surface molding side of the ferrule to be molded, and the die portion for positioning the tip of the arrayed hole forming pin is disposed on the rear end surface molding side. The surface shapes of the arrangement hole forming pin and the guide hole forming pin are measured in a non-contact manner from one side of the arrangement surface of the arrangement hole forming pin, with their tips inserted into the pin insertion holes. Also, the arrangement hole forming pins are arranged in a matrix,
The measurement of the surface shape of the arrayed hole forming pins is sequentially performed line by line. For this reason, the amount of eccentricity of the fiber arrangement hole with respect to the guide pin insertion hole in the formed ferrule can be predicted with high accuracy from the measured surface shapes of the arrangement hole forming pin and the guide hole forming pin. As a result, it is not necessary to adjust the mold while actually repeating the molding of the ferrule many times, so that the mold can be easily adjusted, and a good mold can be easily manufactured.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a mold used in the method of manufacturing a ferrule molding mold according to the first embodiment.

FIG. 2 is a perspective view showing a state in which the shapes of an arrangement hole forming pin and a guide hole forming pin of the mold shown in FIG. 1 are measured.

FIG. 3 is an explanatory view for explaining the shapes of an arrangement hole forming pin and a guide hole forming pin measured in the state shown in FIG. 2 and a method of calculating the amount of eccentricity of the arrangement hole forming pin with respect to the guide hole forming pin from the shapes. It is.

FIG. 4 is a perspective view showing an optical connector having fiber array holes in a matrix.

FIG. 5 is a perspective view showing a ferrule molding die for manufacturing an optical connector having fiber array holes in a matrix.

FIG. 6 is a perspective view showing a state in which the shape of an arrayed hole forming pin is measured in the method of manufacturing a ferrule forming die according to claim 2;

FIG. 7 is an explanatory view for explaining the shape of the arrangement hole forming pin and the guide hole forming pin measured in the state shown in FIG. 7, and a method for obtaining the eccentricity of the arrangement hole forming pin with respect to the guide hole forming pin from the shapes. It is.

FIG. 8 is a perspective view showing a mold used in the method for manufacturing a ferrule molding mold according to the third embodiment.

FIG. 9 is a perspective view showing an optical connector (when not connected).

FIG. 10 is a perspective view showing an optical connector (when connected).

FIG. 11 is a perspective view showing a conventional ferrule molding die.

FIG. 12 is a sectional view of the mold shown in FIG. 11 (when the mold is closed).

[Explanation of symbols]

1, 21, 41 ... lower mold, 2, 22, 42 ... upper mold,
3, 23, 44: pin slider section, 4, 24: pipe slider section, 5, 25, 45: arrangement hole forming pin, 6, 2
6, 46 ... guide hole forming pin, 10, 30 ... receiving pipe, 47 ... pin insertion hole, 100 ... ferrule, 102 ...
Guide pin insertion hole, 103: Fiber array hole.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshiaki Kakii 1 Tayacho, Sakae-ku, Yokohama-shi, Kanagawa Prefecture Sumitomo Electric Industries, Ltd. Yokohama Works (72) Inventor Masahiro Shibata 1-Tayacho, Sakae-ku, Yokohama-shi, Kanagawa Sumitomo Electric Ki Kogyo Co., Ltd. Yokohama Works F-term (reference) 2H036 JA02 QA20 QA49 4F202 AH34 CA11 CB01 CD16 CD30 CK42

Claims (6)

[Claims] 1. A front end of the ferrule having a plurality of parallel arrangement hole forming pins for forming a fiber arrangement hole of an optical connector ferrule and a pair of guide hole forming pins for forming a guide pin insertion hole of the ferrule. A molding die in which a pipe slider portion having a plurality of parallel pin receiving pipes arranged on the surface forming side and having a plurality of parallel pin receiving pipes into which the tips of the arrayed hole forming pins are inserted is disposed on the rear end surface forming side of the ferrule. A method for manufacturing a ferrule forming die to be manufactured, wherein the surface shapes of the arrangement hole forming pin and the guide hole forming pin are measured in a non-contact manner from one side of an arrangement surface of the arrangement hole forming pin, and are measured. The amount of eccentricity of the arrangement hole forming pin with respect to the guide hole forming pin is obtained from the surface shapes of the arrangement hole forming pin and the guide hole forming pin. A method of manufacturing the ferrule forming die by correcting the eccentricity of the arrayed hole forming pin with respect to the guide hole forming pin based on the amount of eccentricity. 2. The arrangement hole forming pin and the guide hole formation pin are measured in a non-contact manner from one side of the arrangement hole formation pin in the length direction of the arrangement hole formation pin. From the surface shape of the guide hole forming pin, in addition to the amount of eccentricity of the arrayed hole forming pin with respect to the guide hole forming pin, the amount of bending of the arrayed hole forming pin is also determined, based on the obtained eccentricity and amount of bending. 2. The method for manufacturing a ferrule molding die according to claim 1, wherein the eccentricity of the arrangement hole forming pin with respect to the guide hole forming pin and the bending of the arrangement hole forming pin are corrected. 3. A circular cross-sectional shape of each of the arrangement hole forming pins and the guide hole forming pins is fitted to the measured surface shapes of the arrangement hole forming pins and the guide hole forming pins using an image processing device. And estimating the centers of the arrangement hole forming pins and the guide hole forming pins from the respective circular cross-sectional shapes, and calculating an eccentric amount of the arrangement hole forming pins with respect to the guide hole forming pins from the estimated centers. Or the manufacturing method of the metal mold | die for ferrule molding of 2. 4. The arrangement hole forming pins are arranged in a matrix of a plurality of rows × a plurality of columns on the pin slider portion, and when measuring the surface shape of the arrangement hole forming pins, After measuring the surface shape by attaching the arrangement hole forming pin only to a distant row, and sequentially measuring the surface shape by attaching the arrangement hole forming pin one line at a time to the one side. A method for producing the ferrule molding die described in the above. 5. A front end of the ferrule having a plurality of parallel arrangement hole forming pins for forming a fiber arrangement hole of a ferrule for an optical connector and a pair of guide hole forming pins for forming a guide pin insertion hole of the ferrule. A molding die in which a pipe slider portion having a plurality of parallel pin receiving pipes arranged on the surface forming side and having a plurality of parallel pin receiving pipes into which the tips of the arrayed hole forming pins are inserted is disposed on the rear end surface forming side of the ferrule. A method for manufacturing a ferrule forming die to be manufactured, wherein the surface shapes of the arrangement hole forming pin and the guide hole forming pin are measured in a non-contact manner from an extending direction of the arrangement hole forming pin, and the measured arrangement hole is measured. The amount of eccentricity of the arrayed hole forming pin with respect to the guide hole forming pin is determined from the surface shape of the forming pin and the guide hole forming pin. A method of manufacturing a ferrule forming die, comprising correcting the eccentricity of the arrayed hole forming pin with respect to the guide hole forming pin based on the center amount, and manufacturing the forming die. 6. A pin slider portion having a plurality of parallel arrangement hole forming pins for forming a fiber arrangement hole of the ferrule for an optical connector and a pair of guide hole forming pins for forming a guide pin insertion hole of the ferrule is provided behind the ferrule. A mold portion having a pin insertion hole that is arranged on the end face forming side and inserts the tip of the arrangement hole forming pin is provided, and the arrangement hole forming pins are arranged in a matrix of a plurality of rows × a plurality of columns on the pin slider portion. A ferrule molding die manufacturing method for manufacturing a molding die, wherein the pin insertion holes are arranged in a matrix of a plurality of rows and a plurality of columns on the mold portion. The surface shape of the hole forming pin and the guide hole forming pin, the array hole forming pin is attached only to the row farthest from one side of the array surface of the array hole forming pin, and the tip of the array hole forming pin is In a state of being inserted in the serial pin insertion hole,
Non-contact measurement of the surface shape from the one side, the amount of eccentricity of the arrangement hole forming pin with respect to the guide hole forming pin is determined from the measured surface shape of the arrangement hole forming pin, and based on the obtained eccentricity. Correcting the eccentricity of the arrayed hole forming pin with respect to the guide hole forming pin, and further, sequentially mounting the arrayed hole forming pins on the one side, one line at a time, performing non-contact measurement of the surface shape of the arrayed hole forming pin. Manufacturing an eccentric amount of the arrayed hole forming pin, correcting the eccentricity of the arrayed hole forming pin with respect to the guide hole forming pin, and manufacturing the forming die. Method.