JP2018004815A - Method for producing ferrule with fiber integrated optical surface and ferrule with fiber integrated optical surface - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing a ferrule with a fiber integrated optical surface having an optical transmission body and a ferrule which can be easily and inexpensively produced.SOLUTION: Firstly, an optical transmission body 110 is arranged in a cavity of a die 200. Next, a pair of sliding pieces 230 and 240 constituting a part of an inner surface of the cavity are moved and the optical transmission body is fixed so as to be sandwiched between the pair of sliding pieces so that the end face of the optical transmission body is exposed into the cavity. Next, the cavity is filled with an optical transmissive resin composition and is solidified, and a ferrule body 122 constituting a part of the ferrule 120 is obtained. Next, the pair of sliding pieces is moved, a space formed by movement of the sliding pieces is filled with the resin composition, and the resin composition is solidified to obtain an optical transmission body support portion 123 constituting a part of the ferrule. Finally, a ferrule 100 with a fiber integrated optical surface having an optical transmission body and a ferrule (ferrule body and optical transmission body support portion) is taken out from the die.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a method for manufacturing a ferrule with an optical surface integrated with a fiber and a ferrule with an optical surface integrated with a fiber obtained by the method for manufacturing a ferrule with an optical surface integrated with a fiber.

  Conventionally, optical transmission bodies such as optical fibers and optical waveguides are used for optical communication. The optical transmission body is optically connected to another optical component or another optical transmission body with its tip held by a resin ferrule.

  In recent years, from the viewpoint of increasing the density of electronic components and improving productivity, a ferrule for an optical connector in which a plurality of optical transmission bodies are fixed to a resin ferrule has been developed (for example, see Patent Document 1). ).

  Patent Document 1 describes an optical connector ferrule in which a plurality of optical fibers are fixed to a resin ferrule. The ferrule for optical connectors described in Patent Document 1 is manufactured by forming a ferrule by molding and then fixing the optical fiber to the ferrule with an adhesive.

  FIG. 1 is a diagram for explaining a method of manufacturing an optical connector ferrule described in Patent Document 1. FIG. As shown in FIG. 1, the ferrule of the optical connector ferrule described in Patent Document 1 includes a lower mold 10, an upper mold 20, a nest 30, and guide pin hole molding for molding guide pin holes. It is manufactured using the pin 41 and the pin holder 40 holding the insertion hole forming pin 42 for forming the fiber insertion hole. The lower mold 10 is disposed on the inner surface of the recess 11, the recess 11 opened on the upper surface, the V-groove 12 holding the guide pin hole forming pin 41 and the insertion hole forming pin 42 disposed at a position sandwiching the recess 11. A resin injection port 13. The upper mold 20 is formed with a nesting insertion port 21 through which the nesting 30 is inserted and removed. The insert 30 is formed in a shape complementary to the insert insertion port 21.

  In the method for manufacturing an optical connector ferrule described in Patent Document 1, a guide pin hole forming pin 41 and an insertion hole forming pin 42 are arranged in the V groove 12 of the lower mold 10. Next, the upper mold 20 with the insert 30 inserted is put on the lower mold 10 and the mold is clamped. At this time, the guide pin hole forming pin 41 and the insertion hole forming pin 42 are urged toward the lower mold 10 by the insert 30. Next, the resin is poured into the cavity from the resin injection port 13. After holding, take out the molded product (ferrule) from the mold.

  Next, the optical fiber is inserted into the fiber insertion hole. Finally, the optical fiber is fixed to the ferrule by pouring an adhesive from the position where the nest 30 is arranged at the time of molding, and the ferrule for optical connector is manufactured.

Japanese Patent Laid-Open No. 2004-062100

  However, the ferrule for an optical connector described in Patent Document 1 has a problem that the manufacturing process becomes complicated because it is necessary to fix the ferrule and the optical fiber with an adhesive.

  On the other hand, insert molding using an optical fiber is conceivable as a method for eliminating the complexity of the manufacturing process described above. However, in insert molding using an optical fiber, a region other than the position where the optical fiber is positioned is formed by pouring resin into the cavity in a state where the optical fiber is positioned with a mold. Next, the mold in which the optical fiber is positioned is removed, and a different mold is arranged to mold the region where the optical fiber has been positioned. As described above, in insert molding using an optical fiber, it is necessary to use two sets of molds or two upper molds and one lower mold, which increases the manufacturing cost. there were.

  Therefore, the present invention provides a method for manufacturing a ferrule with an optical surface having an optical transmission body and a ferrule bonded to an end of the optical transmission body, which can be easily and inexpensively manufactured, and the optical fiber with an optical fiber. An object of the present invention is to provide a fiber-integrated ferrule with an optical surface manufactured by a method for manufacturing a surface ferrule.

  The method for manufacturing a ferrule with an optical surface according to the present invention includes an optical transmission body and an optical surface disposed to face an end surface of the optical transmission body, and is joined to an end of the optical transmission body. A ferrule with a fiber-integrated optical surface having a ferrule, wherein the light is placed in a cavity of a mold for molding the ferrule so that the end surface faces a position to be the optical surface. A step of arranging the transmission body, and a pair of sliding pieces constituting a part of the inner surface of the cavity are moved so that the end face of the optical transmission body is exposed in the cavity. In a state where the optical transmission body is fixed with the pair of sliding pieces, and the light transmitting resin composition is filled in the cavity and solidified. And facing the end face After the step of obtaining a ferrule body that constitutes a part of the ferrule having the academic surface and the step of obtaining the ferrule body, the pair of sliding pieces are moved, and the sliding pieces are moved. A step of obtaining a light transmitting body supporting portion constituting a part of the ferrule, which is joined to the light transmitting body, and solidified by filling a resin composition into the space, and from the mold, the light transmitting body And a step of taking out a ferrule with a fiber-integrated optical surface that includes the ferrule body and the optical transmission body support portion and includes the ferrule joined to the optical transmission body.

  The fiber-integrated ferrule with an optical surface according to the present invention includes an optical transmission body and a ferrule joined to an end portion of the optical transmission body, and the ferrule has an end surface of the optical transmission body therein. A resin-made ferrule main body showing light transmissivity, including an optical surface disposed opposite to the end surface, and at least two surfaces facing each other at which a part of the optical transmission body is disposed A resin optical transmission body supporting portion joined to the ferrule body so that the optical transmission body is exposed to the outside, and the two surfaces are parallel to the optical transmission body and have an outer shape of the optical transmission body. Corresponding convex portions are formed.

  ADVANTAGE OF THE INVENTION According to this invention, the ferrule with a fiber integrated optical surface which can be manufactured easily and cheaply can be provided.

FIG. 1 is a diagram for explaining a method of manufacturing an optical connector ferrule described in Patent Document 1. FIG. 2A and 2B are perspective views of a ferrule with an integrated optical surface according to an embodiment of the present invention. 3A to 3E are diagrams showing the configuration of a ferrule with an optical surface integrated with a fiber. FIG. 4 is a perspective view for explaining the mold. 5A to 5D are views for explaining a method for manufacturing a ferrule with an optical surface integrated with a fiber.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In the following description, after describing the fiber-integrated ferrule with an optical surface, which is an insert-molded product, a method for manufacturing the ferrule with an optical surface with an integrated fiber is described.

(Configuration of fiber integrated ferrule with optical surface)
FIG. 2 is a perspective view of a ferrule 100 with an optical surface integrated with a fiber according to an embodiment of the present invention. FIG. 2A is a perspective view of a ferrule 100 with an optical surface integrated with a fiber, and FIG. 2B is a perspective view of the ferrule 100 with an optical surface integrated with a fiber whose internal structure is indicated by a broken line. FIG. 3 is a diagram showing a configuration of the ferrule 100 with an optical surface integrated with a fiber. 3A is a plan view of the ferrule 100 with an optical surface integrated with a fiber, FIG. 3B is a bottom view, FIG. 3C is a front view, FIG. 3D is a rear view, and FIG. FIG. In the following description, the surface on which the optical surface 132 is disposed is described as “front”.

  As shown in FIGS. 2A and 2B and FIGS. 3A to 3E, the ferrule 100 with an optical fiber integrated optical surface includes an optical transmission body 110 and a ferrule 120. The fiber-integrated ferrule 100 with an optical surface can be manufactured by injection molding as will be described later.

  The type of the optical transmission body 110 is not particularly limited. Examples of the optical transmission body 110 include an optical fiber and an optical waveguide. In the present embodiment, the optical transmission body 110 is an optical fiber. The optical fiber may be a single mode method or a multimode method. The number of optical transmission bodies 110 is not particularly limited, and is four in the present embodiment. The four optical fibers (the optical transmission body 110) are arranged along a direction (Y direction in FIG. 2; long axis direction) connecting the front and back of the ferrule 100 with an optical fiber integrated optical surface, and the optical optical surface with an integrated fiber. They are arranged in a line at regular intervals in the direction connecting the left side surface and the right side surface of the attached ferrule 100 (X direction in FIG. 2; short axis direction). In addition, one end of the optical transmission body 110 is disposed in the ferrule 120 so that the end surface thereof faces the optical surface 132 of the ferrule body 122, and the remaining portion of the optical transmission body 110 is exposed to the outside from the back surface. ing.

  The ferrule 120 holds the optical transmission body 110 and is inserted into another optical component to optically connect the optical transmission body 110 and the other optical component. The ferrule 120 is joined to the end of the optical transmission body 110. The ferrule 120 is formed with two through holes 121 through which a pair of guide pins are inserted. The two through holes 121 are formed along the Y direction. Further, the two through holes 121 are disposed at both ends of the ferrule 120 in the X direction so as to sandwich the optical transmission body 110. The ferrule 120 includes a ferrule body 122 and an optical transmission body support portion 123.

  The ferrule body 122 includes an optical surface 132 that is disposed inside the end surface of the optical transmission body 110 and is opposed to the end surface. The ferrule body 122 is formed of a resin material having optical transparency. Further, the ferrule body 122 is disposed so as to surround the optical transmission body support portion 123 disposed in the central portion of the ferrule 120. The ferrule body 122 is in contact with the front surface, the left side surface, and the back surface of the optical transmission body support portion 123. Further, the ferrule body 122 is not in contact with the top surface, the bottom surface, and the right side surface of the optical transmission body support portion 123. That is, the planar view shape of the ferrule body 122 is substantially U-shaped.

  A front recess 131 for connecting to another optical component is formed on the front surface of the ferrule body 122, and two through holes 121 are opened. An optical surface 132 is disposed on the bottom surface of the front recess 131. The plan view shape of the front recess 131 is not particularly limited as long as it can be connected to other optical components and the position of the optical surface 132 can be secured. In the present embodiment, the planar view shape of the front recess 131 is a substantially rectangular shape with four corners rounded.

  The optical surface 132 is an optical surface that condenses light from the optical transmission body 110 or condenses light incident from the outside onto the optical transmission body 110. In the present embodiment, the shape of the optical surface 132 is a convex lens surface that is convex from the bottom surface of the front recess 131 toward the opening of the front recess 131. Further, the planar view shape of the optical surface 132 is a circle. It is preferable that the central axis of the optical surface 132 coincides with the optical axis of the end surface of the optical transmission body 110. The number of optical surfaces 132 is the same as the number of optical transmission bodies 110. That is, in the present embodiment, the number of optical surfaces 132 is four.

  On the inner surface of the ferrule main body 122 that is in contact with the front surface of the optical transmission body support portion 123 and the inner surface of the ferrule main body 122 that is in contact with the rear surface of the optical transmission body support portion 123, a positioning convex portion 133 is formed facing. ing. The positioning convex portion 133 defines the positional relationship between the ferrule body 122 and the optical transmission body support portion 123. The shape of the positioning convex portion 133 is not particularly limited as long as the above function can be exhibited. In the present embodiment, the shape of the positioning convex portion 133 is a rectangular parallelepiped shape. The right side surface of the positioning convex portion 133 is arranged so as to be flush with the right side surface of the ferrule body 122. Moreover, the through-hole 121 is each opened in the surface which opposes between the two positioning convex parts 133. FIG.

  The optical transmission body support portion 123 is joined to the ferrule body 122 so that a part of the optical transmission body 110 is disposed therein and at least two surfaces (top surface and bottom surface) facing each other are exposed to the outside. . The optical transmission body support portion 123 is formed of a resin material. The optical transmission body support 123 is disposed at the center of the ferrule 120 and is partially surrounded by the ferrule body 122. Positioning recesses 141 are respectively formed at positions corresponding to the positioning protrusions 133 of the ferrule body 122 on the front and back surfaces of the optical transmission body support 123. The shape of the positioning concave portion 141 is a shape complementary to the positioning convex portion 133. That is, the positioning recess 141 has a rectangular parallelepiped shape. In addition, through holes 121 are respectively opened on the opposing surfaces between the two positioning recesses 141. Convex portions having a shape corresponding to the outer shape of the optical transmission body 110 are formed in parallel with the optical transmission body 110 on the two surfaces facing each other of the optical transmission body support portion 123. On the top surface and the bottom surface of the body support portion 123, a first ridge 142 corresponding to the through hole 121 and four second ridges 143 corresponding to the four optical transmission bodies 110 are formed. The first ridge 142 and the through hole 121 are formed in parallel to each other. The second ridge 143 and the optical transmission body 110 are formed in parallel to each other. The shape of the 2nd protruding item | line 143 cut | disconnected by the plane along an X direction and a Z direction is a semicircle, ie, the shape of the 2nd protruding item | line 143 is a semi-cylinder shape. When the second ridges 143 on the top surface and the bottom surface are combined, a cylindrical shape is obtained. This cylindrical shape is the same as the outer shape of the optical transmission body 110.

  As described above, the optical transmission body 110 has an end joined (fixed) to the ferrule body 122, a base end side portion from the end joined to the optical transmission body support 123, and The proximal end portion is joined (fixed) to the ferrule body 122. In addition, the through-hole 121 is formed between the portion formed in the ferrule body 122 on the front side, the portion formed in the ferrule body 122 on the back side, and between them, and is formed in the optical transmission body support portion 123. It consists of parts.

  Further, the positional relationship between the ferrule body 122 and the optical transmission body support portion 123 is such that the two inner side surfaces of the ferrule body 122 including the positioning convex portion 133 and the two outer side surfaces of the optical transmission body support portion 123 including the positioning concave portion 141. Is positioned by.

(Production method of ferrule with optical surface integrated with fiber)
Next, a method for manufacturing the fiber-integrated ferrule 100 with an optical surface will be described. In the method for manufacturing the ferrule 100 with an optical surface according to the present embodiment, the ferrule 120 (the ferrule body 122 and the optical transmission body support portion 123) is manufactured by injection molding, and at the same time, the end of the optical transmission body 110 is attached to the ferrule. Fix to 120. Moreover, the manufacturing method of the ferrule 100 with an optical surface integrated with a fiber according to the present embodiment can be performed with one set of molds. First, a mold for forming the ferrule 120 will be described.

  FIG. 4 is a perspective view for explaining the mold 200. In FIG. 4, the upper mold 220 and the upper mold sliding piece 240 are omitted. 5A to 5D are views for explaining a method of manufacturing the ferrule 100 with an optical surface integrated with a fiber.

  First, the mold 200 used for injection molding will be described. The mold 200 may be one set. The number of divisions and division positions of the mold 200 are not particularly limited. As shown in FIGS. 4 and 5A to 5D, in the present embodiment, the mold 200 includes a lower mold 210, an upper mold 220, a lower mold sliding piece 230, an upper mold sliding piece 240, Side sliding piece 250.

  Lower mold 210 mainly forms the lower half of ferrule body 122. The lower mold 210 includes a ferrule body recess 211 having a shape corresponding to the lower half of the ferrule body 122, two first recesses 212 that support virtual guide pins for forming the two through holes 121, a light And four second recesses 213 corresponding to the transmission body 110. In addition, a sliding piece through hole 214 for sliding the lower mold sliding piece 230 is formed at the center of the bottom surface of the ferrule body recess 211. Further, a side sliding piece 250 is slidable on the front side of the ferrule body recess 211.

  The lower mold sliding piece 230 mainly forms the lower half of the optical transmission body support portion 123. The lower mold sliding piece 230 includes a third recess 231 corresponding to a virtual guide pin for forming the through hole 121, four fourth recesses 232 corresponding to the optical transmission body 110, and positioning of the ferrule body 122. And two step portions 233 corresponding to the convex portion 133 and the optical transmission body support portion 123. The lower mold sliding piece 230 moves in the vertical direction (Z direction in FIG. 4) in the sliding piece through hole 214.

  The upper mold 220 mainly forms the upper half of the ferrule body 122. The upper mold sliding piece 240 mainly forms the upper half of the optical transmission body support. In the present embodiment, the upper mold 220 has the same shape as the lower mold 210, and the upper mold sliding piece 240 has the same shape as the lower mold sliding piece 230. A description of the shape is omitted.

  The side sliding piece 250 mainly forms a front recess 131 and an optical surface 132. The side sliding piece 250 has a side convex portion 251 for forming the front concave portion 131 and a guide pin through hole 252 corresponding to the virtual guide pin. The side convex portion 251 has a shape complementary to the front concave portion 131. An optical surface recess 253 corresponding to the optical surface 132 is formed on the top surface of the side protrusion 251. The side sliding piece 250 moves in the front-rear direction (Y direction in FIG. 4) in the ferrule body recess 211 of the lower mold 210.

  Next, a method for manufacturing the ferrule 100 with an integrated optical surface by injection molding will be described. The manufacturing method of the fiber integrated ferrule 100 with an optical surface includes a step of placing the optical transmission body 110 in the cavity of the mold 200 and a step of fixing the optical transmission body 110 with a pair of sliding pieces 230 and 240 therebetween. And a step of forming the ferrule main body 122, a step of forming the optical transmission member support 123, and a step of taking out the ferrule 100 with an optical surface integrated with a fiber.

  First, the optical transmission body 110 is placed in the cavity of the mold 200 for molding the ferrule 120. In this step, as shown in FIG. 5A, the lower mold slide piece 230 is moved so that the top surface of the lower mold slide piece 230 and the top surface of the lower mold 210 are located on substantially the same plane. Further, the top surface of the convex portion of the side sliding piece 250 is moved to a position that becomes the bottom surface of the front concave portion 131. Then, the optical transmission body 110 is disposed on the second concave stripe 213 and the fourth concave stripe 232. At this time, the end surface of the optical transmission body 110 is disposed so as to face the position (the optical surface recess 253) that becomes the optical surface 132. In addition, the virtual guide pin is disposed on the first concave strip 212 and the third concave strip 231 and is inserted through the guide pin through hole 252.

  Next, the optical transmission body 110 is sandwiched and fixed by the pair of sliding pieces 230 and 240. In this step, as shown in FIG. 5B, the upper mold 220 is overlapped with the lower mold 210 and the upper mold sliding piece 240 is moved so as to be in contact with the lower mold sliding piece 230. At this time, the optical transmission body 110 is fixed by the lower mold slide piece 230 and the upper mold slide piece 240 so that the end face is exposed in the cavity, and is also fixed by the lower mold 210 and the upper mold 220. The

  Next, the ferrule body 122 is formed. In this step, as shown in FIG. 5B, the first gate 215 is fixed with the optical transmission body 110 fixed by the lower mold sliding piece 230 and the upper mold sliding piece 240, and the lower mold 210 and the upper mold 220. (See FIG. 4) A light-transmitting resin composition is filled into the cavity and solidified. At this time, since the optical transmission body 110 is fixed at two places by the mold 200, the optical transmission body 110 is not misaligned even if the cavity is filled with resin. By holding the pressure in this state, the ferrule body 122 is obtained.

  Next, the optical transmission body support 123 is formed. In this step, as shown in FIG. 5C, the lower mold sliding piece 230 is moved downward and the upper mold sliding piece 240 is moved upward. Thus, by moving the lower mold sliding piece 230 and the upper mold sliding piece 240, a space surrounded by the ferrule body 122, the lower mold sliding piece 230, and the upper mold sliding piece 240 is obtained. Newly formed. This space has the same shape as the optical transmission body support portion 123. In this state, the resin composition is filled into the space from the second gate 216 (see FIG. 4) and solidified. By holding the pressure in this state, the ferrule body 122 is obtained.

  Finally, the fiber-integrated ferrule 100 with an optical surface is taken out. In this step, as shown in FIG. 5D, from the opened mold 200, the optical transmission body 110, the ferrule main body 122 and the optical transmission body support portion 123, and the ferrule 120 joined to the optical transmission body 110, The fiber-integrated ferrule with an optical surface 100 having the above is taken out. The fiber-integrated ferrule 100 with an optical surface can be manufactured through the above steps. In the ferrule 100 with an optical surface integrated with a fiber manufactured in this way, the top surface and bottom surface of the optical transmission body support 123 have the top surface and the lower mold of the upper sliding piece 240 to which the optical transmission body 110 is fixed. Since it is formed by the top surface of the sliding piece 230, a shape corresponding to the optical transmission body 110 is formed. Further, since the positioning convex portion 133 and the positioning concave portion 141 are formed by the step portion 223 of the lower mold sliding piece 230 and the step portion of the upper mold sliding piece 240, the ferrule body 122 and the optical transmission body support portion 123 are fixed. The

(effect)
As described above, the manufacturing method of the ferrule with an optical surface according to the present embodiment is such that the lower die sliding piece 230 and the upper die slide are formed with the end face of the optical transmission body 110 exposed in the cavity. The ferrule body 122 is formed by supporting the optical transmission body 110 with the moving piece 240. And the optical transmission body support part 123 is shape | molded using the space formed by the lower mold | type sliding piece 230 and the upper mold | type sliding piece 240 moving. As described above, the fiber-integrated ferrule with an optical surface according to the present embodiment is a fiber having the optical transmission body 110 and the ferrule 120 joined to the optical transmission body 110 using a set of molds. The ferrule 100 with an integrated optical surface is manufactured. Therefore, the fiber-integrated ferrule with an optical surface according to the present embodiment can manufacture the fiber-integrated ferrule with an optical surface 100 easily and inexpensively.

  The fiber-integrated ferrule with an optical surface according to the present invention is useful for optical communication using, for example, an optical transmission body.

DESCRIPTION OF SYMBOLS 10 Lower die 11 Recess 12 V groove 13 Resin injection port 20 Upper die 21 Nest insertion port 30 Nest 40 Pin holder 41 Guide pin hole shaping pin 42 Insertion hole shaping pin 100 Fiber integrated optical surface ferrule 110 Optical transmission body 120 Ferrule 121 Through-hole 122 Ferrule body 123 Optical transmission body support part 131 Front concave part 132 Optical surface 133 Positioning convex part 141 Positioning concave part 142 First convex line 143 Second convex line 200 Mold 210 Lower mold 211 Ferrule main body concave part 212 First Recess 213 Second recess 214 Sliding piece through-hole 215 First gate 216 Second gate 220 Upper mold 230 Lower mold sliding piece 231 Third recess 232 Fourth recess 233 Step part 240 Upper mold sliding piece 250 Side sliding piece 251 Side projection 252 Guide pin through hole 253 Light Academic recess

Claims (2)

A method for manufacturing a ferrule with an integrated optical surface, comprising: an optical transmission body; and a ferrule that includes an optical surface disposed to face an end surface of the optical transmission body and is joined to an end portion of the optical transmission body. There,
Disposing the optical transmission body in a cavity of a mold for molding the ferrule so that the end surface faces the position to be the optical surface;
A pair of sliding pieces constituting a part of the inner surface of the cavity is moved, and the optical transmission body is moved by the pair of sliding pieces so that an end surface of the optical transmission body is exposed in the cavity. Sandwiching and fixing, and
The ferrule having the optical surface opposed to the end surface, in which the optical transmission body is fixed by the pair of sliding pieces, and the cavity is filled with a light-transmitting resin composition and solidified. Obtaining a ferrule body constituting a part of
After the step of obtaining the ferrule body, the pair of sliding pieces are moved, and the space formed by moving the sliding pieces is filled with a resin composition, solidified, and joined to the optical transmission body. A step of obtaining an optical transmission body support part constituting a part of the ferrule,
A step of taking out a ferrule with a fiber-integrated optical surface including the optical transmission body, the ferrule main body and the optical transmission body support portion, and the ferrule joined to the optical transmission body from the mold;
A manufacturing method of a ferrule with an optical surface integrated with a fiber. An optical transmitter;
A ferrule joined to an end of the optical transmission body,
The ferrule is
An end surface of the optical transmission body is disposed therein, and includes an optical surface disposed to face the end surface.
A portion of the optical transmission body is disposed therein, and has a resin optical transmission body support portion joined to the ferrule body so that at least two surfaces facing each other are exposed to the outside, and
On the two surfaces, a convex portion having a shape corresponding to the outer shape of the optical transmission body is formed in parallel with the optical transmission body.
A ferrule with an optical surface integrated with fiber.

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