JP2005309153A - Package structure of optical module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase the joining strength of a package of an optical module, formed of thermoplastic resin, at a laser welding fixation part. <P>SOLUTION: The low-end side of a side wall of a package body 6 is formed into a slanting wall 26 which slants inward and a leg plate part 17 which protrudes outward is provided at the lower end part of the slanting wall 26. While the package body 6 is mounted on a bottom plate 16, a pressing force F is applied from above the package body 6 to generate bending moment M on the root side C of the leg plate part 17 as a fulcrum. With this moment M, the projection tip side of the leg plate part 17 is pressed against the bottom plate 16 and this press contact position is irradiated with laser light 15 to weld and fix the translucent leg plate part 17 of thermoplastic resin and the light-absorptive bottom plate 16, thus constituting the package 2 of the optical module. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an optical module package structure that incorporates a photoelectric conversion element and transmits an optical signal to the outside via an optical fiber.

  FIG. 8 shows a configuration of the optical module 1 disclosed in Patent Document 1. This optical module 1 has a silicon substrate 3 disposed on the bottom surface of a ceramic package 2, and a photoelectric conversion element 4 comprising a light emitting element such as a laser diode and a light receiving element such as a photodiode on the top surface of the silicon substrate 3. The photoelectric conversion element 4 and an optical fiber 5 for optical coupling are mounted. The package 2 is obtained by closing an upper surface opening of a ceramic package body 6 with a ceramic lid member 7, and the package body 6 has an integral structure with the ferrule 8.

  A concave portion 9 is formed on the distal end side of the ferrule 8, and an optical fiber coating portion 10 is inserted and held in the concave portion 9, and the concave portion 9 and the coating portion 10 are fixed by an adhesive 11. The optical fiber 5 exposed from the covering portion 10 extends through the center hole of the ferrule 8 and extends onto the silicon substrate 3 so as to face the photoelectric conversion element 4. In addition, transmission / reception of electric signals between the electric circuit of the silicon substrate 3 and the electric wiring circuit of the photoelectric conversion element 4 and the outside is performed via lead pins 12 exposed on the outer bottom surface of the package 2.

  As is well known, the optical system such as the photoelectric conversion element 4 accommodated in the package 2 deteriorates in characteristics due to moisture, so that the space part in which the optical system in the package 2 is accommodated is hermetically sealed. The optical module 1 shown in FIG. 8 is also metallized on the joint surface between the package body 6 and the lid member 7 and hermetically sealed with a joint material 13 such as solder or brazing material. The gap with the center hole is also hermetically sealed with a bonding material 13 such as solder.

Japanese Patent No. 3359517 JP 2001-105499 A JP 2001-246488 A

  However, as in the device shown in Patent Document 6, in order to form the package body 6 with the ferrule 8 integrated with a ceramic material, a mold corresponding to the shape is produced and sintered using the mold. Since it is fired, there are problems that it takes a lot of time for manufacturing and the cost of the package becomes high.

  As a result of the development of a package product that solves the above-mentioned problems caused by forming the package from a ceramic material and satisfies sealing properties (gas barrier properties) that should be provided as an optical module package, the present inventor has developed a package. The conclusion was reached that it was preferable to fabricate with a thermoplastic resin, and the trial production was started.

  6 and 7 show the configuration of each package structure produced in the initial trial production stage. In the case shown in FIG. 6, the package 2 is made of a light-transmitting thermoplastic resin, and a ferrule insertion tube portion 14 is formed to protrude from the side wall of the package 2. A ferrule 8 made of resin is inserted, and laser light 15 is irradiated from the outside of the ferrule insertion tube portion 14 to weld and fix the ferrule insertion tube portion 14 and the ferrule 8.

  In general, engineering plastics have a weak adhesive force, and it is difficult to strongly bond and fix the bonding materials. However, as described above, by using laser welding without using the adhesive force, The reliability of joining and fixing between the ferrule insertion tube portion 14 and the ferrule 8 can be improved as compared with the case of using. When laser welding is performed, the laser light 15 reaches the ferrule 8 with almost no attenuation loss by using a translucent material for the ferrule insertion tube portion 14 on the side on which the laser light 15 is incident. Since the ferrule 8 is light-absorbing, the temperature of the ferrule 8 is increased by absorbing the heat of the laser light 15, and the surface of the ferrule 8 is melt plasticized at the irradiation position of the laser light 15. As a result of melting and plasticizing the inner surface, the ferrule insertion cylinder 14 and the ferrule 8 are bonded and fixed at the irradiation position of the laser beam 15. In addition, since the laser welding technique itself using a laser beam is known as shown in Patent Documents 2 and 3, for example, the description thereof is omitted.

  In the prototype shown in FIG. 7, a package 2 having a lower opening is similarly formed of a light-transmitting thermoplastic resin, and a foot plate portion 17 projecting outward is formed at the lower end portion of the side wall of the package 2. Then, the package 2 is placed on the bottom plate 16 formed of a light-absorbing thermoplastic resin, and the foot plate portion 17 is irradiated with the laser beam 15 in the state where an external force F pressing the package 2 against the bottom plate 16 is applied. The package 2 and the bottom plate 16 are integrated by laser welding 17 to the bottom plate 16.

  When the prototypes shown in FIGS. 6 and 7 are evaluated, the reliability of the bonding strength can be obtained by performing laser welding rather than fixing the bonding member between plastics using an adhesive. It was found that the bonding strength expected by the person was not obtained. As a result of investigating the cause, the inventor was able to verify that the welding strength of laser welding cannot be obtained if the pressure contact force (pressing force) between the joining members at the laser irradiation locations is weak.

  In the prototype shown in FIG. 6, since the laser welding is performed in a state where the ferrule 8 is only inserted into the tube hole of the ferrule insertion tube portion 14, the ferrule 8 and the ferrule insertion tube portion 14 are irradiated at the irradiation position of the laser beam 15. It was found that the welding strength of the weld did not reach the expected strength because the laser welding was performed in a state where a sufficient pressure contact force was not obtained.

  In the prototype shown in FIG. 7, laser welding is performed by applying a force F that presses the package 2 toward the bottom plate 16, but the side wall of the package 2 is perpendicular to the bottom plate 16, As indicated by the arrows, the applied force F is concentrated from the portion directly under the side wall of the package 2 and applied to the bottom plate 16 side, and an external force (pressing force) is applied from above the foot plate portion 17 at the irradiation position of the laser beam 15. Since the laser welding was performed in a state where a sufficient pressure contact force was not applied between the foot plate portion 17 and the bottom plate 16 at the laser irradiation position, the joining strength of the welding did not reach the expected strength. It has been found.

  The present invention has been made in order to solve the above-described problems, and its purpose is to increase the bonding strength of laser welding by providing a sufficient pressure-contact force between both bonding members at a bonding portion of a package by laser irradiation. It is an object of the present invention to provide an optical module package structure capable of satisfying the requirements.

  In order to achieve the above object, the present invention has means for solving the problems with the following configuration. That is, according to a first aspect of the present invention, there is provided an optical module package structure including a package for accommodating a photoelectric conversion element. The optical fiber is formed between the photoelectric conversion element in the package and the outside by inserting a ferrule of a light-absorbing thermoplastic resin that protrudes outward and holds the optical fiber in the tube hole of the ferrule insertion tube portion. An optical signal is transmitted through the tube, and the tube hole of the ferrule insertion tube portion is formed as a tapered hole that decreases in diameter from the outside toward the inside, and the ferrule decreases in size toward the insertion tip side. The taper angle of the tapered hole of the ferrule insertion tube portion is larger than the taper angle of the ferrule taper shape, Since the ferrule is inserted into the insertion tube hole of the ferrule insertion tube portion, the base side of the taper hole of the ferrule insertion tube portion is pushed wide, and the tip side of the tube wall of the taper hole is supported at the base side with the base side as a fulcrum. A bending moment that tilts and deforms inward in a narrowing direction is generated, and the bending moment causes the tip end of the cylindrical wall of the taper hole to be in pressure contact with the outer peripheral surface of the ferrule, and the ferrule is inserted into the ferrule insertion tube portion at the pressure contact position. A configuration in which laser welding is performed on the cylindrical hole serves as means for solving the problem.

  According to a second aspect of the present invention, there is provided a package structure of an optical module that includes a package that accommodates a photoelectric conversion element and transmits an optical signal between the outside and the photoelectric conversion element in the package via an optical fiber. A package body having an opening and a bottom plate that is fixed to the bottom surface of the package body and closes the bottom surface opening of the package body, and the package body is made of a light-transmitting thermoplastic resin; The peripheral wall of the main body has an inclined wall that is inclined inwardly from the upper end side toward the lower end side, and a foot plate portion projects outwardly from the lower end portion of the inclined wall, and the bottom plate is a light-absorbing thermoplastic resin. The foot plate portion is formed on the base side of the foot plate portion with the base side as a fulcrum by the package body being pressed toward the bottom plate side. A bending moment is generated in such a direction that the tip of the overhang is pressed against the bottom plate. The bottom of the foot plate is pressed against the bottom plate by this bending moment, and the foot plate is laser welded to the bottom plate at this pressure contact position. It is a means to solve the problem with the configuration.

  According to the first invention, the taper is formed in the longitudinal direction of the ferrule insertion tube portion and the longitudinal direction of the ferrule outer shape, and the taper angle of the taper hole of the ferrule insertion tube portion is larger than the taper angle of the ferrule taper shape. Therefore, when a ferrule having a tapered tip is inserted into the tube hole of the ferrule insertion tube portion, the tip of the ferrule contacts the wall surface of the taper hole before penetrating the taper hole. When the ferrule is further pushed in and inserted in this state, the base side of the taper hole is deformed in a direction to be expanded, and as a result, the tip side of the cylindrical wall of the taper hole is tilted inwardly with the base side of the ferrule insertion cylinder as a fulcrum. Deform. After this dynamic deformation exceeds the critical point, the tip end of the cylindrical wall of the tapered hole is pressed against the outer peripheral surface of the ferrule by a bending moment with the base side of the ferrule insertion tube portion as a fulcrum, and the pressure contact state is changed. Since the laser beam is irradiated and welded to the press contact position, the ferrule and the ferrule insertion tube portion are laser welded in a state where a sufficient press contact force (pressing force) is obtained. Thereby, sufficient joining strength (bonding strength) of laser welding can be obtained, and the welding strength and the reliability of hermetic sealing can be improved.

  According to the second aspect of the invention, the peripheral wall of the package body has an inclined wall that is inclined inwardly from the upper end side toward the lower end side, and the foot plate portion projects outwardly from the lower end portion of the inclined wall. Therefore, when the package body is pressed against the bottom plate side, a bending moment is generated in the direction in which the tip end side of the foot plate portion is pushed to the bottom plate side on the base side of the foot plate portion. In a state where the foot plate is pressed against the bottom plate, the foot plate portion is irradiated with laser light to achieve laser welding between the foot plate portion and the bottom plate. That is, laser welding between the foot plate portion and the bottom plate is performed in a state where a sufficient pressing force (pressing force) is applied between the foot plate portion and the bottom plate at the irradiation position of the laser beam. Thereby, sufficient joining strength (bonding strength) of laser welding can be obtained, and the welding strength and the reliability of hermetic sealing can be improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a first embodiment of an optical module package structure of the present invention. The package 2 according to this embodiment has a package body 6 and a lid member 7. The package body 6 has a rectangular container shape having a bottom surface and an open top surface, and is formed by injection molding with a light-transmitting thermoplastic resin. The material of the thermoplastic resin is not particularly limited, but in this embodiment, a liquid crystal polymer suitable as a material having excellent gas barrier properties is used. The liquid crystal polymer contains fibrous elongated crystals, and when the crystals are formed by injection, the crystals are oriented in the same direction, thereby reducing the intermolecular gap and increasing the gas barrier property. By using a liquid crystal polymer having excellent gas barrier properties, moisture can be reliably prevented from entering the package from the outside.

  The lid member 7 may be formed of a ceramic material. In this embodiment, the lid member 7 is formed of a thermoplastic resin like the package body 6, and the lid member 7 is placed on the upper surface of the package body 6 and laser welding is performed. The upper surface opening of the package body 6 is hermetically sealed.

  On one side surface (front end surface 23 in the figure) of the peripheral wall of the package body 6, a ferrule insertion cylinder portion 14 is formed to project outward. This ferrule insertion cylinder part 14 is formed integrally with the package body 6 by injection molding.

  As shown in FIG. 2, the characteristic feature of this embodiment is a taper hole in which the diameter of the tube hole of the ferrule insertion tube portion 14 decreases from the outside toward the inside (from the protruding tip side to the root (base end) side). The ferrule 8 inserted into the tapered hole 18 is formed in a tapered shape having a tapered surface 19 whose diameter decreases from the outer end 21 toward the insertion tip 20, and the ferrule 8 has a light absorbing property. It is composed of a thermoplastic resin. The material of the thermoplastic resin is not particularly limited, but in this embodiment, a liquid crystal polymer suitable as a material having excellent gas barrier properties is used.

  The diameter of the base end 22 of the taper hole 18 is smaller than the diameter of the insertion tip of the ferrule 8, and when the ferrule 8 is inserted into the taper hole 18 as shown in FIG. The front end of the taper hole 18 is brought into contact with the wall surface of the taper hole 18 at a position before passing through the taper hole 18. The taper angle of the taper hole 18 is larger than the taper angle of the taper surface 19 of the ferrule 8. In the drawing, the taper angles of the taper hole 18 and the taper surface 19 are exaggerated, and do not necessarily match the actual angles. The center hole 24 of the ferrule 8 is a hole into which the optical fiber 5 is inserted as shown in FIG.

  Next, the fixing operation by laser welding between the ferrule 8 and the ferrule insertion cylinder portion 14 will be described with reference to FIG. As shown in FIG. 2A, when the ferrule 8 is inserted into the tapered hole 18 of the ferrule insertion cylinder portion 14, the ferrule 8 is positioned at a position where the diameter of the tip of the ferrule 8 and the inner diameter of the tapered hole 18 coincide. 8 is in contact with the wall surface (inner wall surface) of the taper hole 18.

  When the ferrule 8 is further inserted from that position, as shown in FIG. 2 (b), a force acts in a direction to push the base side (base end side) of the tapered hole 18, so that the tube of the ferrule insertion tube portion 14 is moved. A bending moment is generated at the base side 25 of the wall to tilt inward with the base side 25 as a fulcrum. In response to this bending moment, the distal end side of the ferrule insertion cylinder portion 14 is deformed in a direction that tilts inward, and when this deformation exceeds the critical point, the cylindrical wall on the distal end side of the tapered hole 18 becomes narrower ( Deformation further proceeds in the direction in which the inner diameter of the cylindrical wall becomes narrower, and the distal end side of the cylindrical wall of the tapered hole 18 is pressed against the outer peripheral surface of the ferrule 8, and a pressing force (pressing force) P acts on the outer peripheral surface of the ferrule 8. , Maintain its working state.

  In this state, laser welding of the ferrule 8 and the ferrule insertion cylinder 14 is achieved at the entire circumference of the pressure contact by irradiating the pressure contact position between the ferrule 8 and the ferrule insertion cylinder 14 from the outside. The

  In this embodiment, since the laser beam 15 is irradiated to the press contact position between the ferrule 8 and the ferrule insertion cylinder portion 14, welding is achieved in a state where a sufficient press contact force is applied. The strength can be sufficiently increased, and the reliability of welding and the reliability of hermetic sealing by welding can be improved together. Moreover, since the pressure contact force between the ferrule 8 and the ferrule insertion tube portion 14 is automatically applied by simply pushing the ferrule 8 into the tapered hole 18, means such as a jig for applying a pressing force from the outside. This welding fixing work can be performed very easily.

  In addition, although the optical system (optical circuit) and electric circuit containing patent document 1 or another well-known photoelectric conversion element 4 are accommodated in the inside of the package 2 and an optical module is formed, the illustration is abbreviate | omitted.

  FIG. 3 shows a second embodiment of an optical module package structure according to the present invention. In the second embodiment, the same reference numerals are assigned to the same name portions as those in the first embodiment, and the overlapping description of common components is omitted or simplified. The package 2 according to the second embodiment has a package main body 6, a lid member 7, and a bottom plate 16, and the lid member 7 has the same configuration as that of the first embodiment. The upper surface of the package body 6 is closed by being fixed to the upper end of the package body 6.

  The package body 6 has a ferrule insertion tube portion 14 protruding from one surface (front end surface 23 in the figure) of a square frame-shaped side wall having an upper surface and a bottom surface, and the ferrule insertion tube portion 14 has a first embodiment. The ferrule 8 is inserted and fixed as in the example, but the illustration of the ferrule 8 is omitted in FIG. It is desirable that the ferrule insertion cylinder 14 and the ferrule 8 have the same configuration as that of the first embodiment. However, another configuration in which the tapered hole 18 and the tapered surface 19 are not provided is also possible.

  The characteristic feature of the second embodiment is that, as shown in FIG. 4, the peripheral wall (side wall) of the package body 6 is an inclined wall 26 that is inclined inwardly from the upper end side toward the lower end side. In other words, the foot plate 17 projecting outward is formed at the lower end of the inclined wall 26. The lower end surface of the foot plate portion 17 is a flat surface. In this embodiment, the lower end portion of the inclined wall 26 has an upside down T-shape, and a foot plate portion 17 ′ is also formed on the inside. In the package main body 6, the inclined wall 26, the ferrule insertion tube portion 14, and the foot plate portion 17 are integrally formed by injection molding using a light-transmitting thermoplastic resin. The material of the thermoplastic resin is not particularly limited, but it is desirable to use a liquid crystal polymer in consideration of enhancing the gas barrier property. In the drawing, in order to make the invention easy to understand, the inclination angle of the inclined wall 26 is exaggerated and drawn large, but the actual inclination angle is smaller than this.

  The bottom plate 16 is composed of a multilayer substrate, and the material of the bottom plate 16 is composed of a light-absorbing thermoplastic resin. The material of the thermoplastic resin is not particularly limited, but it is desirable to use a liquid crystal polymer in the same manner as in the case of the package body 6 in consideration of enhancing the gas barrier property.

  FIG. 4 shows an assembly configuration of the package body 6 and the bottom plate 16 by laser welding. As shown in FIG. 4A, the package body 6 is placed on the bottom plate 16, and in this state, a pressing force is applied from the upper side of the package body 6 toward the bottom plate 16. The force F applied from the package body 6 to the bottom plate 16 becomes an oblique force along the inclined wall 26, and as a result, as shown in FIG. 4 (b), the foot plate portion 17 has its root side C as a fulcrum. A bending moment in the direction of the arrow M is generated, and the protruding distal end side of the foot plate portion 17 is strongly pressed against the bottom plate (bottom plate portion) 16 in response to this bending moment.

  By fixing the laser beam 15 from the outside to the pressing (pressure contact) position between the foot plate portion 17 and the bottom plate 16, welding and fixing between the foot plate portion 17 and the bottom plate 16 are achieved. This welding and fixing is performed over the entire circumference (front circumference) of the foot plate portion 17. Thereby, the lower surface opening of the package body 6 is hermetically sealed (sealed) by the bottom plate 16. Thus, the laser beam 15 is irradiated and welded to a position where the foot plate portion 17 and the bottom plate 16 are sufficiently pressed (pressed). That is, since welding is achieved in a state in which a sufficient pressure contact force is applied between the foot plate portion 17 and the bottom plate 16, the bonding strength of the welding can be sufficiently increased, and the reliability of the welding and the hermetic sealing by the welding are achieved. It is possible to increase the reliability of stopping.

  Also in the second embodiment, an optical module is formed by accommodating an optical system (optical circuit) or an electric circuit including Patent Document 1 or another known photoelectric conversion element 4 in the package 2. The illustration is omitted.

  In the second embodiment, since the bottom plate 16 is composed of a multilayer substrate, the electrical wiring inside the package 2 can be taken out of the package 2, and is inferior to a ceramic package incorporating a conventional ceramic multilayer plate. The package function without the above can be realized at a lower cost and easier than a ceramic package incorporating a ceramic multilayer board.

  In the configuration of FIG. 3, the lid member 7 is a separate member from the package body 6. However, as shown in FIG. 4A, the lid member 7 is integrated with the package body 6 by injection molding. It is also possible to form. In that case, the portion of the lid member 7 is formed of a light-transmitting thermoplastic resin like the package body 6. If the lid member 7 is formed integrally with the package main body 6 by injection molding, there is no need to join and fix the lid member 7 to the package main body 6, and there are also problems with respect to the airtightness and joint strength of the joint location. This is convenient.

  The present invention can take various embodiments without being limited to the above embodiments. For example, in the first embodiment shown in FIG. 1, the foot plate portion 17 is formed on the upper end portion of the side wall (side peripheral wall) of the package body 6 made of a light-transmitting thermoplastic resin, as in the third embodiment. The lid member 7 and the package body 6 may be laser-welded at the position of the foot plate portion 17. In this case, for example, the side wall of the package body 6 is an inclined wall that inclines inwardly from the upper and lower central portions toward the lower end, and an inclined wall that inclines inwardly from the central portion toward the upper end. The lid member 7 is made of a light-absorbing thermoplastic resin, preferably a liquid crystal polymer.

  Further, in the second embodiment, the foot plate portion 17 projecting outward and the foot plate portion 17 ′ projecting inward are provided so that the lower end portion of the inclined wall 26 forms an inverted T shape. As shown in FIG. 5, only the foot plate portion 17 projecting outward may be provided without providing the foot plate portion 17 ′ projecting inward.

  Furthermore, although the inclined wall 26 and the foot plate portion 17 are provided over the entire circumference of the package body 6, there may be cases where the inclined wall 26 and the foot plate portion 17 are not necessarily provided on the entire circumference, for example, provided on two opposing side surfaces. Even in such a case, the side surface portion provided with the inclined wall 26 and the foot plate portion 17 can improve the reliability of the bonding strength as compared with the conventional laser welding bonding.

  Further, in each of the above embodiments, the outer end of the ferrule 8 may be provided with a recess 9 for accommodating and holding the covering portion 10 of the optical fiber 5 as shown in FIG.

  Further, in each of the above embodiments, the cross-sectional shape of the tube hole of the ferrule 8 and the ferrule insertion tube portion 14 is a circular shape, but this cross-sectional shape is a square, a polygon other than a square, an ellipse, etc. A shape other than a circle may be used.

  Further, in each of the above-described embodiments, the package 2 has a quadrangular shape (a rectangular shape), but may have other different shapes such as a circle, an ellipse, and a polygon other than a square.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a configuration explanatory diagram of a first embodiment of an optical module package structure according to the present invention. It is operation | movement explanatory drawing of the laser welding fixation of the ferrule 8 and the ferrule insertion cylinder part 14 in the example of the embodiment. FIG. 6 is a configuration explanatory diagram of a second embodiment of an optical module package structure according to the present invention. It is explanatory drawing which shows the operation | movement of the laser welding fixation of the package main body 6 and the baseplate 16 in the example of the embodiment. It is explanatory drawing of the other structural example of the package main body 6 made to respond | correspond to 2nd Embodiment. It is explanatory drawing of the welding fixation part of the ferrule insertion cylinder part 14 and the ferrule 8 in the package 2 which this inventor made as an experiment in the initial stage. It is explanatory drawing of the welding fixing | fixed part of the package main body 6 and the baseplate 16 in the package 2 which this inventor made as an experiment in the initial stage. It is explanatory drawing of the optical module currently disclosed by patent document 1. FIG.

Explanation of symbols

2 Package 6 Package body 7 Lid member 8 Ferrule 14 Ferrule insertion tube portion 15 Laser light 16 Bottom plate 17 Foot plate portion 18 Tapered hole 26 Inclined wall

Claims (2)

In the package structure of the optical module provided with a package that accommodates the photoelectric conversion element, the package is made of a light-transmitting thermoplastic resin, and a ferrule insertion cylinder portion is formed to protrude outward on the peripheral wall of the package, A light-absorbing thermoplastic resin ferrule that holds and fixes the optical fiber is inserted into the tube hole of the ferrule insertion tube, and an optical signal is transmitted between the photoelectric conversion element in the package and the outside via the optical fiber. The ferrule insertion tube portion has a cylindrical hole that has a tapered diameter that decreases in diameter from the outside toward the inside, and the ferrule has a tapered shape that decreases in diameter toward the insertion tip. The taper angle of the taper hole of the insertion tube portion is larger than the taper angle of the ferrule taper shape, and the ferrule is a ferrule. A direction in which the base side of the taper hole of the ferrule insertion cylinder part is pushed wide by being inserted into the insertion cylinder hole of the insertion cylinder part, and the tip side of the cylindrical wall of the taper hole becomes narrower with the base side as a fulcrum at the base side A bending moment that tilts and deforms inward is generated, and by this bending moment, the tip side of the cylindrical wall of the tapered hole is pressed against the outer peripheral surface of the ferrule, and at the pressed position, the ferrule contacts the insertion cylindrical hole of the ferrule insertion cylindrical portion. An optical module package structure characterized by being laser-welded. In a package structure of an optical module that includes a package that accommodates a photoelectric conversion element and transmits an optical signal between the outside and the photoelectric conversion element in the package via an optical fiber, the package includes a package body having a bottom opening and the package body A bottom plate that is fixed to the bottom surface of the package body and closes the bottom opening of the package body. The package body is made of a light-transmitting thermoplastic resin, and the peripheral wall of the package body is formed from the upper end side to the lower end. An inclined wall that is inclined inwardly toward the side, a foot plate portion is formed to project outward at a lower end portion of the inclined wall, and the bottom plate is formed of a light-absorbing thermoplastic resin, and the package Since the main body is pressed toward the bottom plate, the base side of the foot plate part is the bottom side of the foot plate part with the base side as a fulcrum. A bending moment is generated in the direction of pressing against the part, and the bottom surface of the foot plate part is pressed against the bottom plate surface by this bending moment, and the foot plate part is laser welded to the bottom plate at this pressure contact position. Optical module package structure.

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