JP5307484B2 - Optical ferrule and manufacturing method thereof - Google Patents

Description

  The present invention includes a positioning block in which a plurality of optical fiber holes and guide pin holes on both sides of these optical fiber holes are integrally formed in one member, and a ferrule body portion obtained by overmolding the positioning block with resin. The optical ferrule which becomes, and its manufacturing method.

For example, the optical ferrule used for the optical connector of the fitting pin positioning system generally called MT connector (corresponding to JIS C 5981: F12 type multi-core optical fiber connector) is positioned on both sides of the optical fiber hole array arranged in one horizontal row. This is a generally square structure with a guide pin hole. The MT connector is usually integrally molded with resin by transfer molding or injection molding from the viewpoint of productivity and cost.
However, the integrated structure of the optical ferrule improves productivity, but has a problem that the mold structure becomes complicated.
There is also a problem that high-precision products cannot be manufactured with a high yield.

  Therefore, as shown in FIGS. 6 and 7, a positioning block 1 in which a plurality of optical fiber holes 1a and guide pin holes 1b on both sides thereof are formed with high precision is pre-molded with resin, and a ferrule body portion is formed on the positioning block 1. An optical ferrule 3 is also manufactured by overmolding 2 with resin (Patent Document 1). Protrusions 1 c are formed on the upper and lower surfaces of the positioning block 1. The ferrule main body 2 is formed with a hollow portion 4 including an optical fiber introduction opening 4a and an adhesive filling window 4b, and a guide groove 5 facing the optical fiber hole 1a.

The optical ferrule 3 in which the positioning block 1 is overmolded with resin is too high for the ferrule body 2 if the arrangement pitch and hole accuracy of the optical fiber holes 1a and guide pin holes 1b of the positioning block 1 are made high. Since accuracy is not required, the resin molding is easy and there is an advantage that an inexpensive optical ferrule can be manufactured.
The reason why high-precision molding of a general optical ferrule that integrally molds the entire fiber including the optical fiber hole is difficult is that the amount of resin in the entire ferrule is not balanced, and distortion occurs when the resin cures and shrinks. One reason is.
The mold structure for preventing the deterioration of accuracy is expensive and the manufacturing process is complicated, which causes a problem that the molding yield is greatly reduced and the manufacturing cost is greatly increased.
Therefore, in Japanese Patent No. 3574620 (Patent Document 1), an optical fiber positioning block that is required to be highly accurate is made in advance, and a frame body is overmolded around it.
By separately manufacturing the optical fiber hole portion that requires high accuracy and the other portions, high accuracy can be easily achieved as compared with a general optical ferrule that is integrally formed as a whole.
And since the management of the manufacturing process is simplified and the mold structure is simplified, the yield is improved and the optical ferrule can be manufactured at low cost.
The arrangement of the optical fiber holes is not limited to the one-dimensional arrangement including only one horizontal optical fiber hole (one-stage optical fiber hole array) as shown in FIG. May be a dimensional array.
JP 2002-156553 (Patent No. 3574620)

Although it is required to significantly reduce the optical connection loss, for this purpose, it is necessary to further improve the accuracy of the optical fiber hole and the fitting pin hole formed in the positioning block.
However, the optical ferrule resin positioning block (described as a chip portion) disclosed in Japanese Patent No. 3574620 has protrusions on the upper surface and the lower surface, and the shape of the positioning block is complicated.
Due to the complexity of this shape, there arises a problem that the accuracy of the optical fiber hole and the fitting pin hole is deviated.
In particular, in Japanese Patent No. 3574620, when the chip portion is molded with resin, the curing and shrinkage of the resin becomes non-uniform, and a slight error occurs in the accuracy of the optical fiber hole and the fitting pin hole. The problem arises that it is not easy to significantly reduce the loss.
The present invention has been made to solve the above problems, and by making the positioning block shape an appropriate shape, it is possible to easily manufacture a high-precision positioning block and achieve high accuracy at low cost. With the goal.
An object of the present invention is to provide a positioning block shape suitable for each of the case where the arrangement of the optical fiber holes is a one-dimensional arrangement and the case of a two-dimensional arrangement.

The invention of claim 1 which solves the above-mentioned problem is that a ferrule body portion is attached to a positioning block in which a two-dimensional array of optical fiber holes and guide pin holes forming a plurality of stages of optical fiber hole arrays are formed in one member. It is an optical ferrule that conforms to the provisions of JIS C 5981 that is overmolded with resin.
In the optical ferrule, the front end surface of the positioning block is a connection end surface by disposing the positioning block on the front end side, and the rear end side is a hollow portion from the positioning block,
The optical fiber hole penetrates the positioning block in the front-rear direction, one opens to the connection end surface, the other opens to the hollow portion,
The positioning block has a uniform cross-sectional shape in the front-rear direction of the ferrule, and has an optical fiber hole forming portion where the optical fiber hole exists, and a guide pin hole protruding outward from both sides of the optical fiber hole forming portion. Having a forming part,
The vertical width in the optical fiber hole forming portion is thicker than the vertical width of the guide pin hole forming portion,
The guide pin hole forming portion has an arcuate contour portion that is concentric with the guide pin hole and has a central angle of approximately 180 degrees;
The connecting portion between the guide pin hole forming portion and the optical fiber hole forming portion, and the end portions of the upper and lower surfaces of the positioning block are all rounded.

According to a second aspect of the present invention, in the optical ferrule of the first aspect, the distance m between the line segment connecting the outer edges of the optical fiber hole row in the optical fiber hole forming portion and the upper and lower surfaces of the positioning block, and the guide pin hole forming portion The thickness t around the pin hole in is substantially equal.
According to a fourth aspect of the present invention, in the optical ferrule of the second aspect, the interval m and the thickness t are 0.25 mm to 0.75 mm.

Invention of Claim 3 is a manufacturing method of the optical ferrule which manufactures the optical ferrule of Claim 1 or 2, Comprising:
The same kind of thermoplastic resin is used for both the positioning block and the ferrule body, and when the ferrule body is overmolded on the positioning block, the contact surface of the positioning block with the overmold resin is melted, so that the positioning block and the ferrule The main body is integrally connected.

The present invention has a cross-sectional shape in which the guide pin hole forming portion of the resin positioning block is a protruding portion protruding outward from the optical fiber hole forming portion.
Thereby, compared with the case of molding a positioning block having a conventional rectangular cross section, the fluidity of the resin in the mold is smoothly performed at the time of molding, and shrinkage distortion is less likely to occur during cooling and curing. .
Therefore, it is effective for high-precision molding of the positioning block.
In this case, since the contour of the portion of the protruding portion protruding from the optical fiber forming portion forms an arc, the fluidity of the resin in the mold is more smoothly performed at the time of molding, and the entire portion of the protruding portion is cooled and cured. Accordingly, the shrinkage is caused in a well-balanced manner, and the occurrence of shrinkage strain is further reduced.
Therefore, it is more effective for high-precision molding of the positioning block.

The cross-sectional area of the positioning block is small compared to the cross-sectional area of the positioning block of the conventional rectangular cross section, but the small cross-sectional area of the positioning block means that the volume is small, so it is small compared to the positioning block of the conventional rectangular cross section. Can be molded with resin amount.
In molding with a small amount of resin, shrinkage strain during cooling is generally small, and in this respect also, molding can be performed with higher accuracy than a conventional positioning block having a rectangular cross section.
In particular, since the difference between the thickness dimension between the uppermost or lowermost optical fiber hole array of the positioning block and the upper or lower surface of the positioning block and the thickness around the pin hole is small, Shrinks in a well-balanced manner, and the molding accuracy can be improved.
And by making the connecting part and the boundary part of the guide pin hole forming part and the optical fiber hole forming part into a round shape, the resin flow in the mold for molding the resin positioning block is made smooth, and at the connecting part Generation | occurrence | production of shrinkage distortion can be suppressed.
In addition, by also round shape ends of the upper and lower surface of the positioning block, Ru can further improve the above effects.
Further, the volume balance of the resin in the entire positioning block becomes relatively uniform, which is advantageous for precision molding.
Since a highly accurate resin molded product can be manufactured as described above, the optical connection characteristics of an optical ferrule using this positioning block can be greatly improved.

  Further, according to the manufacturing method of the optical ferrule, the positioning block and the ferrule body portion are the same type of thermoplastic resin, and the contact surface with the overmold resin of the positioning block is melted and integrally coupled with the ferrule body portion. The positioning block and the ferrule body are firmly and integrally coupled. Therefore, it is suitable for implementing the present invention having a uniform cross-sectional shape in the front-rear direction of the ferrule.

  Hereinafter, an optical ferrule embodying the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of an optical ferrule 13 according to an embodiment of the present invention.
The optical ferrule 13 is an optical ferrule that conforms to the provisions of JIS C 5981 (F12 type multi-fiber optical fiber connector), and includes a positioning block 11 and a ferrule main body portion 12 formed by overmolding resin on the positioning block 11. Consists of.
In the following description, the connection end face side of the optical ferrule is called the front side, the opposite side is called the rear side, the front end face is called the front end face, and the opposite end face is called the rear end face.
1 and 2, the vertical direction refers to the generally vertical direction of the paper surface in FIGS. 1 and 2, and the horizontal direction refers to the generally horizontal direction of the paper surface in FIGS.
The positioning block 11 is a resin molded product, and has a plurality of optical fiber holes 11a and guide pin holes (referred to as fitting pin holes) 11b opened on both sides of a region where the optical fiber holes 11a are present.
The positioning block 11 is vertically symmetric with respect to a line segment (corresponding to the horizontal transverse line 17f in FIG. 2) crossing the middle between the upper surface and the lower surface to the left and right when viewed from the connection end surface side.
Further, it is bilaterally symmetrical with respect to a line segment that vertically cuts the middle of the left end and the bottom end (a line segment perpendicular to the line segment that crosses the left and right).
Thus, it is common in each Example that the positioning block 11 is left-right symmetric and vertical symmetric.
In the connection end face, a horizontal row of optical fiber holes made of a plurality of optical fiber holes 11a are opened.
The optical fiber hole row in the illustrated example has nine stages, and each row is parallel.
Here, the left-right symmetry and the vertical symmetry include not only the outline of the positioning block viewed from the connection end face side but also the arrangement shape of the optical fibers inside the connection end face.
Hereinafter, a region where the cross section of the optical fiber hole 11a is rectangular is called an optical fiber hole forming portion 16, and a region where the guide pin holes 11b on both sides thereof are formed is called a guide pin hole forming portion 17.
The guide pin hole forming portion 17 protrudes on both sides of the optical fiber hole forming portion 16 along a circular guide pin hole.
An outline 17a of the guide pin hole forming portion 17 has an arc shape.
That is, the outline portion 17a forms a part of the circumference.
In another expression, the guide pin hole forming portion 17 protrudes outward from both sides of the optical fiber hole forming portion 16 and has an ear-like appearance.
The center of the arc of the contour portion 17a is concentric with the guide pin hole 11b.
Due to the concentricity, the thickness t (see FIG. 2) around the pin hole of the guide pin hole forming portion 17 is substantially uniform.
The wall thickness t is a width in which a horizontal transverse line 17 f that crosses the center of the positioning block 11 in the vertical direction crosses the guide pin hole forming portion 17 in FIG. 2.
It is preferable that the difference between the thickness dimension m between the uppermost or lowermost optical fiber hole array of the positioning block 13 and the upper or lower surface of the positioning block and the thickness t around the pin hole is small.
Further, it is most preferable that the distance m between the line segment connecting the outer edges of the optical fiber hole row and the upper and lower surfaces of the positioning block 11 and the thickness t around the pin hole are almost the same.
These thicknesses can be set by the distance between the mold core and the inner wall of the mold body in which the core is disposed.
The boundary (corner portion) between the optical fiber hole forming portion 16 and the guide pin hole forming portion 17 has a round shape (indicated by R in FIG. 1).
By making the boundary into a round shape, it is possible to alleviate the occurrence of stress distortion that occurs during resin curing.
Furthermore, the corners (corner portions) at both end portions of the upper and lower surfaces of the positioning block 13 can be rounded (also indicated by R in FIG. 1).
The round shape refers to a curved shape (corner radius) of a corner portion or a tapered shape. By smoothing the contour of the positioning block 13, the corners can be eliminated, thereby suppressing the stress distortion generated after molding.
As a result, it is possible to ensure the forming accuracy of the optical fiber hole and the pin hole.
In addition, the front end surface of the positioning block 11 used as the connection end surface of an optical connector is a smooth surface.
Similarly to a general optical ferrule, the entrance of the optical fiber hole 11a on the rear end side is a tapered opening for facilitating insertion of the optical fiber.
Furthermore, the positioning block 11 has a uniform cross-sectional shape in the front-rear direction of the ferrule (left-right direction in FIG. 3).

The ferrule main body 12 in which another resin is overmolded on the positioning block 11 has a hollow portion 14 including an optical fiber introduction opening 14a and an adhesive filling window 14b, and the optical ferrule rear end side (the right end in FIG. 3). Side) has a flange 12a.
However, in the case of an optical ferrule having a structure without the adhesive filling window 14b, the adhesive filling window 14b is unnecessary.

When the above-described optical ferrule 13 is resin-molded, first, the positioning block 11 is placed in a cavity formed by upper and lower molds.
A mold core for forming a portion of the hollow portion 14 excluding the adhesive filling window 14b is disposed.
The core of this mold has a convex portion that becomes a portion of the adhesive filling window 14b.
As a matter of course, in the case of a molded product without the connecting agent filling window 14, a mold without the convex portion is used.
Two metal rod-shaped pin portions having a circular cross section project from the tip of the core.
These pin portions are punched molds for forming guide pin holes in the ferrule body portion 12.
Therefore, the guide pin hole 21b is formed through the front and rear of the ferrule body in the molded product.
This structure is the same in Example 2 described later.
As is well known, the guide pin hole is thicker than the optical fiber hole.
When the tips of these two pin portions are inserted into the guide pin holes 11b of the positioning block 11, the positioning block is supported exactly at the tips of the mold pins.
The mold is closed while maintaining this structure, and the resin is injected into the cavity from the resin injection portion of the mold.
Thereby, the ferrule main-body part 12 can be overmolded to the positioning block 11, and the optical ferrule 13 can be obtained.

As the resin of the positioning block 11 and the ferrule body 12, a resin used for a general commercially available optical ferrule for an MT connector, for example, PPS or epoxy resin can be used. However, an inexpensive resin different from the positioning block 11 can be used for the ferrule body 12.
However, it is most preferable to use the same resin.
For example, the ferrule body 12 can be overmolded on the positioning block 11 by injection molding using a thermoplastic resin such as PPS.
In that case, when overmolding, the contact surface of the positioning block 11 with the overmold resin is melted, whereby the positioning block 11 and the ferrule body 12 can be firmly and integrally coupled.
As a means for melting and contacting the contact surface with the overmold resin in the positioning block 11, induction heating can be employed.
Thereby, when the overmold resin injected into the mold is cooled and hardened to some extent, for example, a process of once raising the temperature by an induction heating device or the like incorporated in the mold and then cooling can be employed.
The heating means is not limited to the induction heating device, and various heating means can be employed.
However, not necessarily, but it may also not to melt the surface of the positioning block 11 during overmolding.

According to said optical ferrule 13, the positioning block 11 can be made into a simple shape as a uniform cross-sectional shape in the ferrule front-back direction.
As a result, the structure of the mold used for resin molding is simplified and the mold cost is reduced, compared to a chip portion having an uneven shape and having an extreme protrusion in the front-rear direction of the ferrule as in Japanese Patent No. 3574620. In addition, management of the manufacturing process becomes easy. And it becomes possible to improve the shaping | molding precision of resin-made positioning blocks significantly .

More specifically, the guide pin hole forming portion 17 is a protruding portion that protrudes outward from the optical fiber hole forming portion 16, and the conventional rectangular cross section described with reference to FIGS. Compared with the case where the positioning block 1 is molded, the fluidity of the resin in the mold is smoothly performed at the time of molding, and shrinkage distortion is less likely to occur during cooling and curing.
Therefore, it is effective for high-precision molding of the positioning block.
In particular, the guide pin hole forming portion 17 has a substantially arc-shaped contour portion 17a substantially concentric with the guide pin hole 11b, and the thickness t around the pin hole is substantially uniform. The resin flows more smoothly.
And when it cools and hardens | cures, it will shrink | contract with sufficient balance as a whole, and generation | occurrence | production of shrinkage | contraction distortion will become still less.
Further, the difference between the thickness dimension m between the uppermost or lowermost optical fiber hole array of the positioning block 13 and the upper or lower surface of the positioning block 13 and the thickness t around the pin hole is set to be extremely small. As a result, it shrinks in a well-balanced manner when it is cooled and cured.
This also reduces the unbalance of shrinkage, so that the molding accuracy can be improved.
Since the boundary between the optical fiber hole forming portion 16 and the guide pin hole forming portion 17 is a round-shaped round portion and there is no edge portion, it is possible to suppress the occurrence of distortion at the boundary.
The thickness m and the thickness t around the pin hole are preferably 0.25 mm to 0.75 mm, and most preferably 0.7 mm.

Further, when viewed from the connection end face side, the cross-sectional area of the positioning block 11 is smaller than the cross-sectional area of the conventional positioning block having a rectangular cross section.
Since the resin volume is small, molding can be performed with a small amount of resin compared to the positioning block having a rectangular cross section, and since the resin amount is small, there is an advantage that the shrinkage strain during cooling is small.
Therefore, also in this respect, it is possible to perform molding with higher accuracy than the conventional positioning block having a rectangular cross section.
Here, the cross-sectional area of the positioning block will be described.
In FIG. 2, 17 b and 17 c are extended lines on the upper and lower surfaces of the positioning block 11.
17d and 17e are tangents passing through the apex of the contour portion of the positioning block 11, and are perpendicular to the extension lines 17b and 17c.
The cross-sectional area of the positioning block 11 of the present invention is smaller than the area of the rectangular cross section surrounded by the four line segments.

FIG. 4 shows a perspective view of an optical ferrule 23 of a reference example , and FIG. 5 shows a longitudinal sectional view thereof.
The optical ferrule 23 includes a positioning block 21 in which a plurality of optical fiber holes 21a forming one row of optical fiber holes and guide pin holes 21b on both sides of the optical fiber hole region are formed with high accuracy, and the positioning It consists of a ferrule main body 22 that is overmolded on the block 21.
However, the optical fiber hole array is not limited to one stage.
The positioning block 21 is an integrally molded resin product and has a uniform cross-sectional shape in the front-rear direction of the ferrule (generally the left-right direction in FIG. 3).
A guide pin hole forming portion 27 having a guide pin hole 21b is integrally provided on both sides of the optical fiber hole forming portion 26 having the optical fiber hole region.
The optical fiber hole forming portion 26 of this embodiment is a thin rectangle whose vertical width is thinner than that of the first embodiment.
That is, the vertical width of the optical fiber hole forming portion is uniform and thinner than the vertical width of the guide pin hole forming portion.
The guide pin hole forming portion 27 has an arcuate contour portion 27a that is substantially concentric with the guide pin hole 21b and has a central angle larger than 180 degrees.
In the vertical direction in the figure, since the width of the optical fiber hole forming portion 26 is thinner than the width of the guide pin hole forming portion 27, the positioning block as a whole has a dumbbell-shaped cross section (or glasses-shaped cross section). .
The boundary between the guide pin hole forming portion 27 and the optical fiber hole forming portion 26 has a round shape as in the first embodiment.
As in the first embodiment, the center of the arc of the contour portion 27a is concentric with the guide pin hole 21b, whereby the thickness t (see FIG. 2) around the pin hole of the guide pin hole forming portion 27 is substantially uniform. It is.
The wall thickness t is a width that crosses the guide pin hole forming portion 27 along a horizontal transverse line that crosses the vertical center of the positioning block as in the first embodiment, although not particularly illustrated.
As in the first embodiment, the difference between the thickness dimension m (not shown) between the optical fiber hole array of the positioning block 21 and the upper or lower surface of the positioning block and the thickness t around the pin hole is extremely small. ing.
That is, the distance between the edge of the optical fiber hole array and each surface of the positioning block is almost the same as the thickness t around the pin hole.
The thickness dimension m and the thickness t around the pin hole are preferably 0.25 mm to 0.75 mm, and most preferably 0.7 mm.

After this positioning block 21 is pre-molded with resin, the positioning block 21 is overmolded with resin to have a hollow portion 24 including an optical fiber introduction opening 24a and an adhesive filling window 24b. A ferrule body 22 having a flange 22a is formed on the end side (the right end in FIG. 3) to obtain an optical ferrule 23 in which the positioning block 21 and the ferrule body 22 are integrated.
Similarly to the first embodiment, a fitting pin hole (guide pin hole) is formed using a mold for forming a fitting pin hole (guide pin hole).
As with a general commercially available MT connector, a guide groove 25 for guiding an optical fiber to the optical fiber hole 21a of the positioning block 21 is formed at a position facing the adhesive filling window 24b of the hollow portion 24 of the ferrule body portion 22. Can be formed.
Since the guide groove 25 has a structure adopted in a normal commercially available MT connector, description thereof is omitted.
When the adhesive filling window 24b is not provided, the other molding steps are the same as those in the first embodiment, and thus description thereof is omitted.

In the optical ferrule 23, the positioning block 21 can be downsized by reducing the wall thickness of the optical fiber hole forming portion 26 by using a dumbbell-shaped cross section (or a spectacle-shaped cross section).
As in the first embodiment, the resin amount is reduced by downsizing, and the volume balance of the entire positioning block is relatively uniform, which is advantageous for precision molding.
In addition, similar to the optical ferrule 13 described above, the mold structure is simple and the cost is low, the fluidity of the resin in the mold is smooth, the shrinkage distortion during cooling and hardening is small, and effective for high-precision molding. The effect that it is is acquired.
As already described in Example 1, it is important to reduce the total resin amount and eliminate the uneven thickness in order to perform precision molding.

In addition, as an example of the optical ferrule in which the positioning block has a dumbbell cross-sectional shape, the case where the optical fiber hole array is one-stage (in the case of a one-dimensional array) has been described. Even in the case of a small number of plural columns (in the case of a two-dimensional array), the positioning block can have a dumbbell cross-sectional shape.
In the present invention, the optical ferrule includes not only the use of the optical ferrule built in the optical connector housing but also the case where it is used as a terminal component for an interface provided between the optical fiber and another optical element.

It is a perspective view of the optical ferrule of one Example of this invention. It is the perspective view which showed only the positioning block in FIG. It is a longitudinal cross-sectional view of the optical ferrule of FIG. It is a perspective view of the optical ferrule as a reference example of this invention. It is a longitudinal cross-sectional view of the optical ferrule of FIG. The conventional optical ferrule is shown, (a) is a top view, (b) is a longitudinal cross-sectional view. It is the front view which showed only the positioning block in FIG.

Explanation of symbols

11, 21 Positioning block 11a, 21a Optical fiber hole 11b, 21b Guide pin hole 12, 22 Ferrule main body part 12a, 22a Gutter part 13, 23 Optical ferrule 14, 24 Hollow part 14a, 24a Optical fiber introduction opening parts 14b, 24b Adhesive filling window 16, 26 Optical fiber hole forming portion 17, 27 Guide pin hole forming portion 17a, 27a Arc-shaped contour portion 25 Guide groove

Claims (4)

JIS C 5981 regulation , in which the ferrule body is overmolded with resin in a positioning block in which a two-dimensional array of optical fiber holes and guide pin holes forming a multi-stage optical fiber hole array are formed in one member Is an optical ferrule that complies with
In the optical ferrule, the front end surface of the positioning block is a connection end surface by disposing the positioning block on the front end side, and the rear end side is a hollow portion from the positioning block,
The optical fiber hole penetrates the positioning block in the front-rear direction, one opens to the connection end surface, the other opens to the hollow portion,
The positioning block has a uniform cross-sectional shape in the front-rear direction of the ferrule, and has an optical fiber hole forming portion where the optical fiber hole exists, and a guide pin hole protruding outward from both sides of the optical fiber hole forming portion. Having a forming part,
The vertical width in the optical fiber hole forming portion is thicker than the vertical width of the guide pin hole forming portion,
The guide pin hole forming portion has an arcuate contour portion that is concentric with the guide pin hole and has a central angle of approximately 180 degrees;
An optical ferrule characterized in that both the connecting portion between the guide pin hole forming portion and the optical fiber hole forming portion and the end portions of the upper and lower surfaces of the positioning block have a round shape.   The distance m between the line segment connecting the outer edges of the optical fiber hole row in the optical fiber hole forming portion and the upper and lower surfaces of the positioning block is substantially equal to the thickness t around the pin hole in the guide pin hole forming portion. The optical ferrule according to claim 1, wherein An optical ferrule manufacturing method for manufacturing the optical ferrule of claim 1 or 2, comprising:
The same kind of thermoplastic resin is used for both the positioning block and the ferrule body, and when the ferrule body is overmolded on the positioning block, the contact surface of the positioning block with the overmold resin is melted, so that the positioning block and the ferrule A method of manufacturing an optical ferrule, wherein the main body is integrally coupled.   The optical ferrule according to claim 2, wherein the interval m and the thickness t are 0.25 mm to 0.75 mm.

Images