JP5183033B2 - Optical module assembly method - Google Patents

Description

  The present invention relates to an optical connector housing method having stable connection characteristics and an optical module assembling method capable of realizing the fixing of an optical fiber at a low cost.

  An optical module is used as a system in which a part of a wire harness is replaced with an optical fiber, for example, each node is connected with an optical fiber (for example, see Patent Document 1). The optical module 11 of Patent Document 1 is a pigtail type optical module, and includes a pair of optical fibers 12 and 12, ferrules 13 and 14 provided at ends of the optical fibers 12 and 12, and a known circuit (not shown). FOT (Fiber Optic Transceiver) 15 and 16 mounted on the substrate, FOT case 19 having FOT mounting portion 17 and ferrule insertion portion 18, spacer 20 fitted to ferrule insertion portion 18, FOT mounting portion 17 and FOT 15 , 16 and a shield case 21 that is attached across the board.

Thus, in the optical module as in Patent Document 1, the ferrules 13 and 14 are provided at the ends of the optical fibers 12 and 12, and the ferrules 13 and 14 are fitted into the ferrule insertion portion 18 to assemble the optical module. Therefore, since the number of parts for assembling the optical module increases, there is a problem that the cost of parts increases as the number of optical connectors mounted on the vehicle increases. Therefore, conventionally, a locking method that can lock the plastic optical fiber to the connector housing without using a part such as a ferrule has been proposed (for example, see Patent Document 2). As shown in FIG. 2, this patent document 2 melts a part of a fiber coating material 7 of a plastic optical fiber 2 and engages a melt coating 8 with a projection 5 provided on a fiber fixing portion 4, thereby making a plastic optical fiber. 2 is locked to the connector housing 1.
Japanese Patent Laying-Open No. 2005-258017 (page 4, FIG. 1) JP 2004-157258 A (page 4, FIG. 2)

  As described above, in the optical module 11 that performs optical / electrical signal conversion of Patent Document 1, the FOTs 15 and 16 are fixed to the FOT case 19 in advance for light input and output. The FOT case (housing) 19 and the optical fibers 12 and 12 are fixed to the two ferrule insertion holes 32 and 33 provided in parallel with the ferrule insertion portion 18 of the FOT case 19. A holder (locking part) that inserts ferrules (cylindrical parts) 13 and 14 fixed to the tip of the ferrule and holds the ferrules 13 and 14 in a spacer fitting hole 34 provided in the upper part of the ferrule insertion part 18 of the FOT case 19. ) And the ferrules 13 and 14 are fixed.

  The optical module 11 of Patent Document 1 includes both a FOT case 19 for inserting ferrules 13 and 14 fixed to the tips of optical fibers 12 and 12, and a spacer 20 as a holder for fixing the ferrules 13 and 14 together. Consists of resin molded products. For this reason, in Patent Document 1, there are tolerances in resin molding between the FOT case 19 and the spacer 20 that is a holder. There is also an intersection between the spacer 20 and the ferrules 13 and 14. For this reason, the optical module 11 of Patent Document 1 has a problem that these tolerances appear as gap variations with respect to the FOTs 15 and 16 and stable connection characteristics cannot be obtained.

  Further, in the optical module 11 of Patent Document 1, the ferrules 13 and 14 fixed to the tips of the optical fibers 12 and 12 are inserted into and removed from the ferrule insertion holes 32 and 33 provided in the FOT case 19 due to the above-described tolerance. At this time, it appears as a change in the gap between the FOTs 15 and 16, and the initial characteristics as the FOT cannot be maintained.

  Furthermore, since the optical module 11 of Patent Document 1 requires the ferrules 13 and 14, there are problems that the number of parts is increased and the man-hours related to the ferrules 13 and 14 are increased. .

  On the other hand, in the connector housing 1 of Patent Document 2, the plastic optical fiber 2 is attached to the vibration welding machine 20 and ultrasonic vibration is applied to the fiber coating material 7 of the plastic optical fiber 2 protruding from the end face of the connector housing 1. A melt coating (engagement material) 8 formed by melting the fiber coating material 7 protruding from the end face of the connector housing 1 is filled in the gap between the inner peripheral surface of the fiber fixing portion 4 and the plastic optical fiber 2 to fix the fiber. The projection 5 provided on the inner peripheral surface of the portion 4 and the melt coating 8 are engaged to fix the plastic optical fiber 2 to the connector housing 1.

  This patent document 2 is a fusion obtained by attaching a plastic optical fiber 2 to a vibration welding machine 20 and applying ultrasonic vibration to the fiber coating material 7 of the plastic optical fiber 2 protruding from the end face of the connector housing 1. The coating 8 is filled in the gap between the inner peripheral surface of the fiber fixing portion 4 and the plastic optical fiber 2 to fix the plastic optical fiber 2 to the connector housing 1. Is mounted on the FOT mounting portion of the FOT case, and an optical / electrical device constructed by inserting a ferrule fixed to the tip of the optical fiber 1 into two ferrule insertion holes provided in parallel with the ferrule insertion portion of the FOT case. There is a problem that it cannot be applied to the signal conversion module.

  An object of the present invention is to provide an optical module assembling method capable of realizing the fixing of an optical connector housing having stable connection characteristics and an optical fiber at low cost.

The optical module assembling method according to claim 1 includes an optical fiber, a FOT (Fiber Optic Transceiver), a FOT case, and a holder. The optical fiber and the FOT are mounted on the FOT case, and the mounted optical fiber. In an assembling method of an optical module that forms an optically coupled state by fixing with a holder,
The FOT is
Facing the plurality of lead frames electrically connected to the circuit of the circuit board, different lead frame with the mounted light emitting element and a light receiving element ones of the lead frame of the plurality of, light emitting element, a light receiving element A window is formed, and includes a light emitting element, a light receiving element, and a mold part that covers the electrical connection part.
The FOT case is
It is composed of a molded product molded using a synthetic resin material, and is formed in a state where the optical fiber insertion portion and the FOT mounting portion are continuous in the front and rear,
The optical fiber insertion part is:
Two optical fiber insertion holes in parallel for inserting the optical fiber, and a holder fitting hole for fitting and sealing the holder,
The two optical fiber insertion holes are
A hole that penetrates the FOT case in the front-rear direction and inserts the optical fiber, and has an end that opens to the FOT mounting portion. In the holder fitting hole , the bottom part is formed in a groove having a U-shaped cross section, becomes a hole having a circular cross section, and then opens in the FOT mounting part.
The FOT mounting part is
The FOT can be attached so as to cover each front side of the FOT, and includes a plurality of positioning protrusions for determining the mounting position of the FOT, and a guide for guiding the lead frame. When mounted, the position of the window facing the light emitting element is aligned with the opening of the optical fiber insertion hole, and the position of the window facing the light receiving element is aligned with the opening of the optical fiber insertion hole. Become
The holder is
A resin molded product for preventing the optical fiber inserted into the optical fiber insertion hole from being formed of a translucent material equivalent to the outer sheath of the optical fiber that can be welded to the outer sheath of the optical fiber, After being fitted into the holder fitting hole, it is welded to the outer sheath of the optical fiber, and is composed of a resin molded product for preventing the optical fiber inserted into the optical fiber insertion hole,
The FOT is pressed from one side and positioned by the plurality of positioning protrusions of the FOT mounting portion of the FOT case, and the lead frame of the FOT is guided by the guide and fixed to the FOT mounting portion of the FOT case. By aligning the window of the FOT with the opening of the optical fiber insertion hole,
The optical fiber whose end face is peeled off and the end surface treatment is made to enter the optical fiber insertion hole of the FOT case from the other side, and the holder fitting hole is inserted into the holder fitting hole from the circular cross-section of the insertion entrance portion of the optical fiber insertion hole. Guided by the groove at the bottom, inserted into the hole having a circular cross section of the optical fiber insertion portion 7 and projected to the FOT mounting portion, the tip of the optical fiber is opened from the opening of the optical fiber insertion hole, and the FOT Guide you to the window,
Thereafter, the holder is fitted and attached to the holder fitting hole of the optical fiber insertion portion of the FOT case so as to be substantially flush with the upper surface of the optical fiber insertion portion of the FOT case,
After that, by irradiating and transmitting laser light from above the holder, irradiating the black outer skin of the optical fiber to heat and melt, melting the holder close to the raised portion due to melting of the optical fiber sheath, The holder is in contact with the raised portion of the outer sheath of the optical fiber in a melted state to weld the holder and the outer sheath of the optical fiber.

According to the optical module assembling method of the first aspect, even if there is a tolerance in the FOT case and holder manufactured by resin molding, the optical fiber sheath is directly welded to the holder fitted in the FOT case. It is possible to prevent the variation from being influenced by the component accuracy.
According to the optical module assembling method of the first aspect, the welded state between the holder and the optical fiber sheath is improved by combining the material of the holder and the material of the outer sheath of the optical fiber so as to be translucent. Can do.

  According to the optical module assembling method of the first aspect, since the optical fiber sheath is directly welded to the holder fitted to the FOT case, it is not necessary to use a ferrule that has been fixed to the tip of the optical fiber. Since the number of parts is reduced, it can be manufactured at low cost.

  Furthermore, according to the optical module assembling method of the first aspect, since the optical fiber sheath is directly welded to the holder fitted in the FOT case, a permanent connection by welding can be obtained, and a change in gap due to insertion / extraction or the like can be obtained. It is hard to get up and can maintain the initial characteristics.

  Hereinafter, description will be given with reference to the drawings. FIG. 1 is a diagram showing an embodiment of an optical module assembling method of the present invention. 2 to 4 are diagrams showing a procedure for realizing the optical module assembling method shown in FIG.

  1 and 2, reference numeral 1 indicates an optical module of the present invention. The optical module 1 is a pigtail type optical module, and includes a pair of optical fibers 2 and 3, FOT (Fiber Optic Transceiver) 4 and 5 which are light receiving and emitting elements mounted on a known circuit board (not shown), The FOT case 8 having the FOT mounting portion 6 and the optical fiber insertion portion 7 for mounting the FOTs 4 and 5 and the holder 9 fitted to the optical fiber insertion portion 7 are configured (two-core configuration). This shall not be the case, that is, a single core configuration may be used). Hereinafter, each component will be described in detail.

  One of the optical fibers 2 and 3 is prepared for transmission and the other is prepared for reception. The optical fibers 2 and 3 in this embodiment are the same, and POF (Plastic Optical Fiber) is adopted. The optical fibers 2 and 3 include a core, a clad provided on the core, a primary sheath provided on the clad, and a secondary sheath provided on the primary sheath (this embodiment). The known optical fiber strands are referred to as optical fibers 2 and 3, and the secondary sheath of the optical fiber strands is referred to as the outer sheath of the optical fibers 2 and 3). Each end of the optical fibers 2 and 3 is in a peeled state in which the primary sheath and the secondary sheath are removed with appropriate lengths. The optical fibers 2 and 3 have a black secondary sheath which is an outer skin.

  The FOTs 4 and 5 include a plurality of lead frames 10 and 11 that are electrically connected to the circuit of the circuit board (not shown), a light emitting element (not shown) (for example, LD or LED), a light receiving element (for example PD) (not shown), It has mold parts 12 and 13. A light emitting element and a light receiving element (not shown) are mounted on one of the lead frames 10 and 11. In addition, the light emitting element and the light receiving element (not shown) are electrically connected to the remaining lead frames 10 and 11. The mold parts 12 and 13 are formed so as to cover and protect a light emitting element and a light receiving element (not shown) and the electrical connection part. The mold parts 12 and 13 are molded using a light-transmitting synthetic resin. The mold parts 12 and 13 are formed with windows 12a and 13a facing a light emitting element and a light receiving element (not shown).

  The FOT case 8 is a molded product molded using a synthetic resin material, and is formed in a state where the optical fiber insertion portion 7 and the FOT mounting portion 6 are continuous in the front-rear direction. The optical fiber insertion portion 7 includes two optical fiber insertion holes 14 and 15 arranged in parallel for inserting the optical fibers 2 and 3, and a holder fitting hole 16 for fitting for fitting and sealing the holder 9. Have. Each of the optical fiber insertion holes 14 and 15 is a hole penetrating in the front-rear direction of the FOT case 8, and is formed so that end portions thereof open to the FOT mounting portion 6. Therefore, the optical fiber insertion holes 14 and 15 are formed in a circular hole in the insertion entrance portion of the optical fibers 2 and 3, and are half open at the holder fitting hole 16. That is, grooves 16 a and 16 b having U-shaped cross sections are formed at the bottom of the holder fitting hole 16. Further, these holes continue to become holes 14a and 15a having a circular cross section and open to the FOT mounting portion 6.

  The FOT mounting portion 6 is a portion where these can be mounted so as to cover the front sides of the FOTs 4 and 5, and includes a plurality of positioning protrusions 17 that determine the mounting positions of the FOTs 4 and 5, and the lead frames 10 and 11. Guides 18 and 19 for guiding are provided. When the FOTs 4 and 5 are mounted on the FOT mounting part 6, the position of the window 12 a is aligned with the opening of the optical fiber insertion hole 14, and the position of the window 13 a is aligned with the opening of the optical fiber insertion hole 15. Yes.

  The holder 9 is a resin molded product for preventing the optical fibers 2 and 3 inserted into the optical fiber insertion holes 14 and 15 from coming off, and the optical fibers 2 and 3 can be welded to the outer sheath of the optical fibers 2 and 3. It is made of a semi-transparent material that is equivalent to the outer skin. For example, nylon resin (PA12) is used as the material of the holder 9. The holder 9 is welded to the outer sheath of the optical fibers 2 and 3 after being fitted into the holder fitting hole 16.

  As shown in FIG. 3, the optical module 1 configured in this way first presses FOTs 4 and 5 (only FOT 4 is shown in FIG. 3) from the right side of FIG. 3 as indicated by an arrow A. The FOT case 8 is attached to the FOT attachment part 6. When the FOT 4 is mounted on the FOT mounting portion 6 of the FOT case 8, the FOT 4 is positioned by a plurality of positioning projections 17 protruding from the FOT mounting portion 6 of the FOT case 8, and the lead frame 10 of the FOT 4 is guided by the guide 19. And fixed to the FOT mounting portion 6. When the FOT 4 is mounted on the FOT mounting portion 6, the position of the window 12 a of the FOT 4 is aligned with the opening of the optical fiber insertion hole 14.

  Next, the optical fibers 2 and 3 (only the optical fiber 2 is shown in FIG. 3) whose end surfaces are peeled and end-face processed are shown in FIG. 3 from the left side of the optical fiber insertion portion 7 of the FOT case 8. The optical fiber insertion hole 14 is entered from the direction indicated by the arrow B. First, the optical fiber 2 is inserted into the hole having a circular cross section at the insertion entrance portion of the optical fiber insertion hole 14 of the optical fiber insertion portion 7, and guided to the groove 16 a at the bottom by the holder fitting hole 16 to insert the optical fiber. Proceed to the hole 14 a having a circular cross section of the part 7 and project to the FOT mounting part 6.

  Thereafter, the holder 9 is mounted in the holder fitting hole 16 of the optical fiber insertion portion 7 of the FOT case 8 as shown by an arrow C (see FIG. 2). The holder 9 is configured to be substantially flush with the upper surface of the optical fiber insertion portion 7 of the FOT case 8 when mounted in the holder fitting hole 16 of the optical fiber insertion portion 7. When the holder 9 is mounted in the holder fitting hole 16 of the optical fiber insertion portion 7 of the FOT case 8, the laser beam D (see FIG. 4) is irradiated from above the holder 9. The laser beam D passes through a holder 9 made of a translucent material as shown in FIG. 5 and is irradiated to a secondary sheath that is an outer skin of the optical fibers 2 and 3. Since the outer sheaths of the optical fibers 2 and 3 are black, they absorb the laser beam D and generate heat, and the outer sheaths of the optical fibers 2 and 3 are melted. When the outer sheath of the optical fibers 2 and 3 is melted, the melted portion is raised as shown in FIG. Further, the heat generated by the outer sheaths of the optical fibers 2 and 3 also melts the holder 9 made of the adjacent translucent material. When the holder 9 is melted, the melted portion of the holder 9 rises as shown in FIG. 6 and comes into contact with the raised portions of the outer skin of the optical fibers 2 and 3 in a melted state. When the holder 9 and the outer sheath of the optical fibers 2 and 3 come into contact with each other in this melted state, the holder 9 is half of the same material as the outer sheath of the optical fibers 2 and 3 that can be welded to the outer sheath of the optical fibers 2 and 3. Since it is formed of a transparent material, the holder 9 is welded to the outer skin of the optical fibers 2 and 3 as shown in FIG.

  Therefore, according to the present embodiment, since the outer sheath of the optical fibers 2 and 3 is directly welded to the holder 9 fitted to the optical fiber insertion portion 7 of the FOT case 8, it is attached to the tip of the conventional optical fiber. There is no need to use a ferrule (cylindrical part) that is fixed, and the number of parts is reduced, so that it can be manufactured at low cost.

  Further, according to the present embodiment, since the outer sheath of the optical fibers 2 and 3 is directly welded to the holder 9 fitted to the optical fiber insertion portion 7 of the FOT case 8, the outer sheath and the holder of the optical fibers 2 and 3 are attached. 9 can be obtained, and a change in the gap due to insertion / extraction or the like hardly occurs, and the initial characteristics can be maintained.

  Next, another embodiment of the optical module assembling method of the present invention will be described with reference to FIG. FIG. 7 is an exploded perspective view showing another embodiment. In addition, the same code | symbol shall be attached | subjected to the member fundamentally the same as said example, and description shall be abbreviate | omitted.

  In FIG. 7, reference numeral 1 'denotes the optical module of the present invention. This optical module 1 ′ is a pigtail type optical module, and is configured to receive and emit light mounted on a pair of optical fibers 2 and 3 (the optical fiber 3 is not shown; see FIG. 2) and a known circuit board (not shown). FOTs 4 and 5 (illustration of FOT 5 is omitted; see FIG. 2), a FOT case 8 having a FOT mounting part 6 for mounting FOTs 4 and 5, and an optical fiber insertion part 7, and an optical fiber insertion part 7 in advance. The holder 9 is formed by insert molding and integrated. The optical module 1 'differs from the optical module 1 of the above example (see FIG. 2) in that the holder 9 is insert-molded in advance and the holder fitting hole 16 is not present.

  The FOT case 8 is a molded product molded using a synthetic resin material, and a holder 9 is insert-molded. The FOT case 8 is formed in a state where an optical fiber insertion portion 7 integrated with a holder 9 and a FOT mounting portion 6 are continuous in the front-rear direction. Insert molding is a method of making an integrated composite part by loading an insert into a mold and then injecting resin, wrapping the insert with molten resin and solidifying it.

  In the above configuration, first, the FOT 4 is pressed as shown by the arrow A to be mounted on the FOT mounting portion 6 of the FOT case 8. When the FOT 4 is mounted on the FOT mounting portion 6 of the FOT case 8, the FOT 4 is positioned by a plurality of positioning protrusions 17 protruding from the FOT mounting portion 6 of the FOT case 8, and the lead frame 10 of the FOT 4 is guided by the guide 19 (FIG. 3). 4) and is fixed to the FOT mounting portion 6. When the FOT 4 is mounted on the FOT mounting portion 6, the position of the window 12a of the FOT 4 is aligned with the opening of the optical fiber insertion hole 14 (although not specifically illustrated, the FOT 5 is also mounted in the same manner).

  Next, the optical fiber 2 whose tip has been peeled and whose end face has been processed is inserted into the optical fiber insertion hole 14 of the optical fiber insertion portion 7 of the FOT case 8 as indicated by an arrow B. And it is made to project to the FOT mounting part 6 (although not specifically shown, the optical fiber 3 is also mounted in the same manner).

  Thereafter, the laser beam D (see FIG. 4) is irradiated from above the holder 9. The laser beam D passes through a holder 9 made of a translucent material as shown in FIG. 5 and is irradiated to a secondary sheath that is an outer skin of the optical fiber 2. Since the outer sheath of the optical fiber 2 is black, it absorbs the laser beam D and generates heat, and the outer sheath of the optical fiber 2 is melted. When the outer sheath of the optical fiber 2 is melted, the melted portion rises as shown in FIG. Further, the holder 9 made of the adjacent translucent material is also melted by the heat generation of the outer sheath of the optical fiber 2. When the holder 9 is melted, the melted portion of the holder 9 rises as shown in FIG. 6 and comes into contact with the raised portion of the outer sheath of the optical fiber 2 in a melted state. When the holder 9 and the outer sheath of the optical fiber 2 come into contact with each other in such a melted state, the holder 9 is formed of a translucent material equivalent to the outer sheath of the optical fiber 2 that can be welded to the outer sheath of the optical fiber 2. Therefore, the holder 9 is welded to the outer skin of the optical fiber 2 as shown in FIG. 6 (although not particularly shown, the optical fiber 3 is also welded in the same manner).

  Therefore, according to this embodiment, since the outer cover of the optical fiber 2 is directly welded to the holder 9 that is insert-molded and integrated with the optical fiber insertion portion 7 of the FOT case 8, the tip of the optical fiber as in the prior art is used. It is not necessary to use a ferrule (cylindrical part) that is fixed to the head, and the number of parts is reduced, so that it can be manufactured at low cost.

  Further, according to the present embodiment, since the outer sheath of the optical fiber 2 is directly welded to the holder 9 that is insert-molded and integrated with the optical fiber insertion portion 7 of the FOT case 8, the outer sheath of the optical fiber 2 and the holder 9 are integrated. Can be obtained, and a change in the gap due to insertion / extraction or the like hardly occurs, and the initial characteristics can be maintained.

The figure which shows one Embodiment of the optical module assembly method of this invention. It is a disassembled perspective view of the optical module for implement | achieving the optical module assembly method shown in FIG. FIG. 3 is a cross-sectional front view showing an assembly procedure of an exploded perspective view of the optical module for realizing the optical module assembling method shown in FIG. 2. FIG. 4 is a cross-sectional front view showing a state where the optical module is assembled from the assembly procedure of the exploded perspective view of the optical module for realizing the optical module assembling method illustrated in FIG. 3. It is a figure which shows the permeation | transmission state of a laser beam when irradiating a laser beam from on a holder in the assembly procedure of the exploded perspective view of the optical module for implement | achieving the optical module assembly method shown in FIG. It is a figure which shows the state which the outer_skin | epidermis of a holder and an optical fiber welds with the laser beam irradiated in FIG. It is a disassembled perspective view which shows other one Embodiment of the optical module assembly method of this invention.

Explanation of symbols

1, 1 ′ ………………………… Optical module 2, 3 …………………… Optical fiber 4, 5 …………………… FOT (light emitting and receiving element)
6 ………………………… FOT mounting part 7 ………………………… Optical fiber insertion part 8 ……………………… FOT case 9 ………………… ......... Holders 14, 15 ……………… Optical fiber insertion hole 16 ……………………… Holder fitting hole

Claims (1)

An optical fiber, a FOT (Fiber Optic Transceiver), a FOT case, and a holder are provided. The optical fiber and the FOT are attached to the FOT case, and the optical fiber is fixed by the holder. In an assembling method of an optical module for forming a coupled state,
The FOT is
Facing the plurality of lead frames electrically connected to the circuit of the circuit board, different lead frame with the mounted light emitting element and a light receiving element ones of the lead frame of the plurality of, light emitting element, a light receiving element A window is formed, and includes a light emitting element, a light receiving element, and a mold part that covers the electrical connection part.
The FOT case is
It is composed of a molded product molded using a synthetic resin material, and is formed in a state where the optical fiber insertion portion and the FOT mounting portion are continuous in the front and rear,
The optical fiber insertion part is:
Two optical fiber insertion holes in parallel for inserting the optical fiber, and a holder fitting hole for fitting and sealing the holder,
The two optical fiber insertion holes are
A hole that penetrates the FOT case in the front-rear direction and inserts the optical fiber, and has an end that opens to the FOT mounting portion. In the holder fitting hole , the bottom part is formed in a groove having a U-shaped cross section, becomes a hole having a circular cross section, and then opens in the FOT mounting part.
The FOT mounting part is
The FOT can be attached so as to cover each front side of the FOT, and includes a plurality of positioning protrusions for determining the mounting position of the FOT, and a guide for guiding the lead frame. When mounted, the position of the window facing the light emitting element is aligned with the opening of the optical fiber insertion hole, and the position of the window facing the light receiving element is aligned with the opening of the optical fiber insertion hole. Become
The holder is
A resin molded product for preventing the optical fiber inserted into the optical fiber insertion hole from being formed of a translucent material equivalent to the outer sheath of the optical fiber that can be welded to the outer sheath of the optical fiber, After being fitted into the holder fitting hole, it is welded to the outer sheath of the optical fiber, and is composed of a resin molded product for preventing the optical fiber inserted into the optical fiber insertion hole,
The FOT is pressed from one side and positioned by the plurality of positioning protrusions of the FOT mounting portion of the FOT case, and the lead frame of the FOT is guided by the guide and fixed to the FOT mounting portion of the FOT case. By aligning the window of the FOT with the opening of the optical fiber insertion hole,
The optical fiber whose end face is peeled off and the end surface treatment is made to enter the optical fiber insertion hole of the FOT case from the other side, and the holder fitting hole is inserted into the holder fitting hole from the circular cross-section of the insertion entrance portion of the optical fiber insertion hole. Guided by the groove at the bottom, inserted into the hole having a circular cross section of the optical fiber insertion portion 7 and projected to the FOT mounting portion, the tip of the optical fiber is opened from the opening of the optical fiber insertion hole, and the FOT Guide you to the window,
Thereafter, the holder is fitted and attached to the holder fitting hole of the optical fiber insertion portion of the FOT case so as to be substantially flush with the upper surface of the optical fiber insertion portion of the FOT case,
After that, by irradiating and transmitting laser light from above the holder, irradiating the black outer skin of the optical fiber to heat and melt, melting the holder close to the raised portion due to melting of the optical fiber sheath, An optical module assembling method, wherein the holder is in contact with the raised portion of the outer sheath of the optical fiber in a molten state to weld the holder and the outer sheath of the optical fiber.

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