JP4623512B2 - Optical module and optical connector having the same - Google Patents

Description

  The present invention relates to an optical module for optical communication and an optical connector provided with the optical module.

  An optical module for optical communication is arranged as a photoelectric conversion element package (for example, a package containing a semiconductor light emitting element such as a semiconductor laser or a semiconductor light receiving element such as a photodiode) and an end of an optical fiber as an optical transmission path. A ferrule, a lens, and a holder for housing them.

  Such an optical module is configured such that a photoelectric conversion element (semiconductor light-emitting element or semiconductor light-receiving element) in a photoelectric conversion element package and an optical fiber are optically coupled via a lens. .

  In such an optical module, in order to increase the optical coupling efficiency between the optical fiber and the photoelectric conversion element package, it is necessary to arrange the ferrule and the lens and the lens and the photoelectric conversion element package in the holder with high accuracy. .

  For example, in the optical module 100 as shown in FIG. 10, in order to eliminate the mounting error of the lens 101, the holder 102 and the lens 101 are integrally injection-molded with a resin, and the sleeve 104 for fitting the ferrule 103 and the photoelectric conversion are performed. A photoelectric conversion element package mounting hole 106 for accommodating the element package 105 is formed with high accuracy. As a result, such an optical module 100 is held in the holder 102 with the ferrule 103 and the photoelectric conversion element package 105 positioned with high precision with respect to the lens 101, and optical communication can be performed with a desired optical coupling efficiency. It can be done. As a conventional technique related to such an optical module, for example, Patent Document 1 (see FIGS. 3, 4, 5 and the like) can be cited. Note that one or a plurality of such optical modules 100 are accommodated in a housing according to the purpose of use to constitute an optical connector.

JP 2001-194558 A.

  However, as shown in FIGS. 11A and 11B, when the optical module 100 of Patent Document 1 is in a state where a force F that intersects the axis CL of the sleeve 104 is applied, the axis of the ferrule 103 is used. The core 107 has a problem that the optical coupling efficiency between the ferrule 103 and the photoelectric conversion element package 105 varies because the core 107 is inclined by the angle θ with respect to the axis CL of the sleeve 104.

  Therefore, the present invention provides a variation in the optical coupling efficiency between the optical transmission line and the photoelectric conversion element package even if a force that causes a fluctuation in the optical coupling efficiency acts on the end of the optical transmission line. It is an object of the present invention to provide an optical module capable of suppressing optical interference and performing stable optical communication and an optical connector including the same.

In the first aspect of the present invention, the end of the optical transmission path is fitted into the end mounting hole on the one end side in the axial direction of the holder,
A lens that engages a photoelectric conversion element package in a cylindrical portion on the other axial end side of the holder, and protrudes toward the photoelectric conversion element package between the end mounting hole of the holder and the cylindrical portion. And an optical module that optically couples the optical transmission line and the photoelectric conversion element package via the lens. In this optical module, the end mounting hole has a fitting guide portion having a tapered hole shape in which the diameter of the hole gradually decreases from the opening side toward the hole bottom side, and the fitting guide portion. A first hole located closer to the bottom of the hole, and a second hole that is smaller in diameter than the first hole and located closer to the bottom of the hole and fits to the tip of the end of the optical transmission line And. Moreover, in this optical module, the photoelectric conversion element package is
Light from the semiconductor light emitting element is emitted. And in the said cylindrical part, the said photoelectric conversion element package is accommodated so that internal space may arise between the said lenses, and the said photoelectric conversion element package is adhere | attached and fixed with an adhesive agent. In addition, a through hole is formed in the cylindrical portion to communicate the internal space between the photoelectric conversion element package and the lens and the external space of the cylindrical portion. Further, the internal space between the photoelectric conversion element package and the lens through the through-hole formed in the cylindrical portion is a gas that is generated from the adhesive and changes the refractive index of light. To the outside space.

According to invention of Claim 1, since the dimension of the hole depth direction of the 2nd hole located in the deepest part of an edge part attachment hole can be shortened, the hole precision of a 2nd hole is improved. Thus, the fitting gap between the second hole and the tip end side of the end of the optical transmission path can be reduced. As a result, according to the first aspect of the present invention, even if a predetermined force acts on the optical transmission path in a direction intersecting the axial direction of the end mounting hole, the tilt of the optical transmission path with respect to the end mounting hole is extremely small. Since it is possible to suppress a decrease in optical coupling efficiency between the optical transmission line and the photoelectric conversion element package, efficient optical communication is possible. In addition, according to the present invention, when the photoelectric conversion element package is bonded and fixed in the cylindrical portion, the gas generated when the adhesive is cured can be released from the through hole to the outside of the holder. Optical communication between the optical transmission line and the photoelectric conversion element package is performed with a desired coupling efficiency without the refractive index of light in the internal space between the element package being changed by the gas generated from the adhesive. Can do.

A second aspect of the present invention relates to an optical connector comprising the optical module according to the first aspect of the present invention and a housing for accommodating and holding the optical module.

According to the optical connector of the invention of claim 2 , efficient optical communication is possible by using an optical module having high optical coupling efficiency.

  According to the present invention, even if a force that causes fluctuation in optical coupling efficiency is applied to the end of the optical transmission line, fluctuation in optical coupling efficiency between the optical transmission line and the photoelectric conversion element package is achieved. It is possible to provide an optical module and an optical connector equipped with the optical module that can suppress optical interference and perform stable optical communication.

  Hereinafter, the best embodiment of the present invention will be described in detail with reference to the drawings.

(First embodiment)
1 to 6 are views for explaining an optical module 1 according to an embodiment of the present invention. Among these, FIG. 1 is a longitudinal sectional view of the holder 2 constituting the optical module 1, and is a sectional view cut along the line CC in FIG. FIG. 2 is a longitudinal sectional view showing a state in which the ferrule 3 is mounted on the holder 2. FIG. 3 is a longitudinal sectional view schematically showing a state where the photoelectric conversion element package 5 is attached to the holder 2. 4 is an enlarged cross-sectional view showing a part of the holder 2 shown in FIG. 1, and is an enlarged cross-sectional view showing the end mounting hole 6 of the holder 2. As shown in FIG. FIG. 5 is a side view of one end of the holder 2 as viewed from the direction A in FIG. FIG. 6 is a side view of the other end side of the holder 2 as seen from the direction B in FIG.

  The holder 2 shown in these drawings is formed by injection molding a light transmissive resin material (for example, PEI, PC, PMMA, etc.). An end attachment hole 6 for removably engaging the ferrule 3 is formed on one end side in the direction along the axis CL of the holder 2 (see FIGS. 1, 4 and 5). The end mounting hole 6 is open to one end side (left end side in FIG. 1) in the direction along the axis CL of the holder 2, and the ferrule 3 is accommodated and held therein (see FIG. 2 and FIG. 3).

  As shown in detail in FIG. 4, the end mounting holes 6 are, in order from the opening 7 side toward the hole bottom 8 side, the fitting guide portion 10, the first hole portion 11, the connection taper portion 12, A second hole portion 13 is formed, and the first hole portion 11 and the second hole portion 13 are smoothly connected by the connection taper portion 12. A relief hole 15 is formed in the hole bottom 8 of the end mounting hole 6. The fitting guide portion 10 in the end portion mounting hole 6 is a tapered hole that gradually decreases the hole diameter from the left end surface 16 (left end surface in FIGS. 1 and 4) 16 of the holder 2 toward the hole bottom 8. It is formed so that the movement of 3 can be smoothly guided. The first hole portion 11 extends from the hole bottom side end portion (the right end portion in FIGS. 1 and 4) 17 of the fitting guide portion 10 toward the hole bottom 8 side, and has a cylindrical shape with the same inner diameter. It is a hole and is formed to have an inner diameter such that a gap with the outer peripheral surface of the ferrule 3 is 1.5 to 2.0 μm so that the movement of the ferrule 3 can be smoothly guided. Further, the connecting taper portion 12 includes a bottom end portion (right end portion in FIGS. 1 and 4) 18 of the first hole portion 11 and an opening end portion portion (left side in FIGS. 1 and 4) of the second hole portion 13. This is a tapered hole portion that smoothly connects the end portion 20. The second hole portion 13 is formed to have an inner diameter such that a gap with the outer peripheral surface of the ferrule 3 is 0 to 0.5 μm. The ferrule 3 is connected to the shaft core (the holder 2 of the holder 2). The axis line CL) can be held with high accuracy. For example, the gap between the ferrule 3 and the end mounting hole 6 has a different contraction rate of the resin at the time of injection molding depending on the shape (thickness difference, etc.) of the optical module 1. Can be set in consideration of the above.

  The escape hole 15 is a hole having a smaller diameter than the second hole portion 13 of the end attachment hole 6, prevents the optical fiber at the tip of the ferrule 3 from contacting the holder 2, and the ferrule 3, the optical fiber, and the holder 2. It is designed to prevent any of these from being damaged.

  Of the end mounting holes 6, the ratio between the hole depth (hole depth in the direction along the axis CL) L2 of the second hole 13 and the outer diameter D of the ferrule 3 is (L2 / D) = 0. .8 to 1.6 is determined. This is because when (L2 / D) = 0.8 or less, the holding force of the ferrule 3 is weak, and when (L2 / D) = 1.6 or more, the hole accuracy (cylindrical shape accuracy) of the second hole portion 13 is increased. This is because it becomes difficult to improve accuracy.

  The dimension ratio of the second hole 13 and the first hole 11 in the hole depth direction (the direction along the axis CL) is (L1 / L2) = 1, where L1 is the hole depth of the first hole 11. 0.02 to 3.04. This is because if the dimensions are such, the formation position of the second hole portion 13 does not become too deep, and the workability of inserting the ferrule 3 into the second hole portion 13 does not deteriorate.

  An angle θ1 formed by the slope of the fitting guide portion 10 and the axis CL of the end portion attachment hole 6 may be formed in a range of 20 ° to 45 °. Further, the angle θ2 formed by the slope of the connection taper portion 12 and the axis CL of the end portion attachment hole 6 may be formed in a range of 5 ° to 30 ° (see FIG. 4).

The other end side in the direction along the axis CL of the holder 2 in (right end in FIG. 1) is, (package containing the semiconductor light-emitting element as a photoelectric conversion element) The photoelectric conversion element package tubular portion for accommodating hold 5 21 is formed (see FIGS. 3 and 6). The cylindrical portion 21 is formed on the right end surface 2 of the holder 2.
A bottomed photoelectric conversion element package mounting hole 23 formed from 2 along the axis CL direction (toward the left end face 16 side of the holder 2) is formed. The photoelectric conversion element package mounting hole 23 has a shape shown in FIG. 6 when viewed from the direction B in FIG. A recess 26 is formed on the inner peripheral surface of the photoelectric conversion element package mounting hole 23 on the right end surface 22 side along the axis CL as a ratio from the right end surface 22 (a / b) = 0.25-0. It is formed in 5 ranges. Four recesses 26 are formed at equal intervals in the circumferential direction of the inner peripheral surface of the photoelectric conversion element package mounting hole 23. The recess 26 can favorably fix the optical module 1 and the photoelectric conversion element package 5. Right end surface 2 of the inner peripheral surface of the photoelectric conversion element package mounting hole 23
The concave portion 26 formed on the second side can function as an adhesion portion when the photoelectric conversion element package 5 is adhered. Moreover, the recessed part 26 may be used as a part which temporarily fixes the photoelectric conversion element package 5 with an ultraviolet curing adhesive, and may adhere and fix the photoelectric conversion element package 5 with a thermosetting adhesive.

  As shown in FIGS. 1 and 6, the cylindrical portion 21 is formed with two through holes 27 that connect the internal space 40 and the external space 41 of the photoelectric conversion element package mounting hole 23. The positional relationship between the concave portion 26 and the through hole 27 in the axis CL direction is such that the through hole 27 is formed closer to the hole bottom 25 than the top of the cap 31 of the photoelectric conversion element package 5 with respect to the concave portion 26 formed on the right end surface 22 side. It is good to be done. Further, the through hole 27 may be formed so that the through hole 27 and the recess 26 are opposed to each other between the recesses 26 with respect to the positional relationship in the circumferential direction of the photoelectric conversion element package mounting hole 23. A plurality of the through holes 27 can be formed radially with respect to the axis CL.

  The through-hole 27 is formed in a sealing member (for example, an adhesive agent) after the adhesive that adheres the photoelectric conversion element package 5 to the photoelectric conversion element package mounting hole 23 is solidified and the gas generated from the adhesive is completely discharged. , Plugs or lids formed of a resin such as rubber) 29 (see FIG. 3B). You may use this through-hole 27 so that it may prevent that the cylindrical part 21 fills with gas.

  In the holder 2, an aspheric lens 30 protruding toward the photoelectric conversion element package 5 accommodated in the cylindrical portion 21 is integrally formed on a partition wall 28 positioned between the cylindrical portion 21 and the end portion mounting hole 6. Is formed. The aspheric lens 30 is formed so that its optical axis coincides with the axis CL of the holder 2 (the center of the end mounting hole 6 and the center of the photoelectric conversion element package mounting hole 23). ).

光電変換素子パッケージ５は、略円筒状のキャップ３１の内部に収容した図示しない半
導体発光素子（例えば、半導体レーザ等）から光を発光するようになっている。そして、
この光電変換素子パッケージ５のリード３２が突出するキャップ端面３３側には、キャッ
プ３１の外周に突出する略円環状の鍔部３５が一体形成されている。この光電変換素子パ
ッケージ５は、予め接着剤が塗布された光電変換素子パッケージ取付穴２３に嵌合された
状態において、光電変換素子パッケージ取付穴２３に対して図示しない調芯機によって光
ファイバと光電変換素子パッケージ５の位置決めが行われる。

The photoelectric conversion element package 5, the semiconductor light emitting element (not shown) housed inside a substantially cylindrical cap 31 (e.g., a semiconductor laser or the like) has become Let 's you emit light from. And
On the side of the cap end surface 33 from which the lead 32 of the photoelectric conversion element package 5 projects, a substantially annular flange 35 projecting to the outer periphery of the cap 31 is integrally formed. When the photoelectric conversion element package 5 is fitted in the photoelectric conversion element package mounting hole 23 to which an adhesive has been applied in advance, the photoelectric conversion element package 5 is optically coupled to the photoelectric conversion element package mounting hole 23 by an aligner (not shown). The conversion element package 5 is positioned.

  Therefore, according to the present embodiment, it is possible to prevent deviation between the axis CL of the photoelectric conversion element package 5 and the axis of the photoelectric conversion element package mounting hole 23, and hold the photoelectric conversion element package 5 in the holder 2 with high accuracy. Therefore, the shift of the axial center position between the ferrule 3 and the photoelectric conversion element package 5 is suppressed, and the fluctuation of the optical coupling efficiency can be suppressed.

  In the operation of bonding and fixing the photoelectric conversion element package 5 to the cylindrical portion 21, gas is generated in the process of curing the adhesive, and the gas passes through the through hole 27 formed in the cylindrical portion 21. Is discharged from the internal space 40 of the cylindrical portion 21 to the external space 41 (see FIG. 3A). As a result, the gas generated from the adhesive does not fill the internal space 40 between the aspheric lens 30 and the photoelectric conversion element package 5, and the gas in the internal space 40 (gas generated from the adhesive). It is possible to prevent the change in the refractive index of the light due to the above, and the optical coupling efficiency between the ferrule 3 and the photoelectric conversion element package 5 is not impaired. In addition, poor curing of the adhesive due to the generated gas can be prevented.

  When the adhesive is completely cured and the bonding operation between the photoelectric conversion element package 5 and the cylindrical portion 21 is completed, the through hole 27 of the cylindrical portion 21 is sealed by a sealing member 29 such as an adhesive, a rubber plug, or a lid. It is possible to prevent dust and the like floating in the external space 41 of the holder 2 from entering the internal space 40 of the cylindrical portion 21, and the photoelectric conversion element package 5 is corroded by moisture in the air. Can also be prevented (see FIG. 3B). Note that, unlike the plastic holder 2, the cap 31 is made of a metal having a smaller amount of thermal deformation than plastic.

Figure 7 compares in a state where the ferrule 3 is attached to the end fitting hole 6, and when an external force F is act on the ferrule 3, the optical coupling efficiency between the case where the external force F is not applied, the present invention product It is a figure shown in comparison with an example. In FIG. 7, the magnitude of the force applied when there is load rotation is 2.5 N (about 0.25 kg) (ferrule pull-out force test [1... In optical fiber connector test (JIS C 5961)]. 0 to 2.5N]), and the direction in which the force is applied is the direction perpendicular to the axis of the ferrule.

  As shown in FIG. 7, the optical module 1 configured as described above has a force in the direction intersecting the axis CL of the end mounting hole 6 acting on the ferrule 3 (the load in the product of the present invention in FIG. 7). Even in the case of rotation), the inclination θ of the axis of the ferrule 3 and the axis CL of the second hole 13, that is, the tilt of the ferrule 3 with respect to the axis CL is extremely small and intersects the axis CL of the end mounting hole 6. The optical coupling efficiency is almost the same as the state in which no force acts on the ferrule 3 (in the case of no load rotation of the product of the present invention in FIG. 7). On the other hand, as shown in FIG. 8, the inner diameter of the end mounting hole 6 is the same as the inner diameter of the first hole 11 of the optical module 1 of the present embodiment (the inner peripheral surface of the end mounting hole 6 and the ferrule). The optical module 1 formed with a gap between the outer peripheral surface of 3 and the outer peripheral surface of 1.5 is approximately the same optical coupling efficiency as the product of the present invention without load rotation, but with load rotation. In some cases, the force causes rotational movement of the ferrule 3 with the central axis in the direction perpendicular to the paper surface, and the inclination θ between the axis of the ferrule 3 and the axis CL of the second hole 13 increases, and the optical of the present invention product It is much lower than the effective coupling efficiency. As described above, the product of the present invention can transmit light with a substantially constant optical coupling efficiency even when a force of 2.5 N at the maximum in the direction intersecting the axis CL of the end mounting hole 6 acts on the ferrule 3. Can do.

  As described above, the optical module 1 according to this embodiment is configured so that the optical fiber and the photoelectric conversion element package 5 can be connected to each other even when a predetermined force is applied to the ferrule 3 in the direction intersecting the axis CL of the end attachment hole 6. Variations in the optical coupling efficiency between them can be suppressed, and efficient light transmission becomes possible.

  Further, according to the optical module 1 of the present embodiment, the optical module 100 shown in FIG. 10 has a light spot position and a ferrule by the lens 30 even when a force that causes deterioration in optical coupling efficiency acts on the ferrule 3. 3 and the inclination of the ferrule 3 can be minimized. Furthermore, it is produced more than the one in which the overall dimensional accuracy of the end mounting hole 6 is increased by integrally molding the dimensional accuracy of the second hole 13 from the first hole 11 of the end mounting hole 6 with high accuracy. Efficiency can be improved.

  Further, according to the optical module 1 of the present embodiment, since the aspheric lens 30 is formed integrally with the holder 2, it is not necessary to align the optical axis of the aspheric lens 30 and the axis CL of the holder 2, and the optical module. 1 is facilitated, and the productivity of the optical module 1 is improved.

  Further, according to the present embodiment, the number of parts can be reduced, and the productivity can be improved as described above, so that the product price of the optical module 1 can be reduced.

  Further, according to the present embodiment, since the aspheric lens 30 is formed integrally with the holder 2, there is no possibility of dust entering between the aspheric lens 30 and the photoelectric conversion element package 5, and optical communication is performed. It can be done reliably. However, if a mode in which a separate lens is bonded and fixed to the holder is adopted, dust may enter between the lens and the photoelectric conversion element package through a gap in a portion where uneven adhesion occurs.

The optical module 1 shown in FIG. 3 is, for example, as shown in FIG.
And a 1, is accommodated in the housing 36, the lead 32 is soldered to the electric board (not shown) in the housing 36, constituting the optical connector 37.

(Second Embodiment)
In the present embodiment, a modification of the photoelectric conversion element package mounting hole 23 of the optical module 1 in the first embodiment will be described. In the present embodiment, components that are substantially the same as those in the first embodiment are denoted by the same reference numerals, and descriptions that are the same as those in the first embodiment are omitted.

  The photoelectric conversion element package mounting hole 23 in the present embodiment has a configuration in which the through hole 27 is formed without forming the recess 26, and the other configuration of the optical module 1 is the same as that in the first embodiment. For example, the opening end shape of the inner periphery of the right end surface 22 of the photoelectric conversion element package mounting hole 23 is a shape that does not have the recess 26. That is, a shape that accommodates and holds the photoelectric conversion element package 5 with a gap in the cylindrical portion 21, for example, a shape that matches the outer peripheral shape of the cap 31 of the photoelectric conversion element package 5 that is fixed to the optical module 1 (opening on the inner peripheral surface) The end shape is integrally formed into a circle, a rectangle, or a polygon. A gap between the cylindrical portion 21 and the cap 31 of the photoelectric conversion element package 5 is set to a dimension that allows deformation of the cylindrical portion 21 due to environmental changes such as temperature. Further, the outer peripheral shape of the cap 31 of the photoelectric conversion element package 5 is not limited to the shape having the flange portion 35, and may be other shapes such as a cylindrical shape, a rectangular shape, or a polygonal shape without the flange portion 35. .

  The photoelectric conversion element package mounting hole 23 and the photoelectric conversion element package 5 can be fixed by bonding and fixing to the flange portion 35 of the cap 31 of the photoelectric conversion element package 5 at the right end surface 22 of the photoelectric conversion element package mounting hole 23. It can be done. Alternatively, the photoelectric conversion element package mounting hole 23 may be bonded and fixed to the cap 31 of the photoelectric conversion element package 5 on the inner peripheral surface including the end portion on the opening end side. The cap 31 of the photoelectric conversion element package 5 is not limited to a metal one but may be a resin one.

  A plurality of through-holes 27 for discharging gas generated when the photoelectric conversion element package 5 is cured and fixed in the cylindrical portion 21 with an adhesive are formed in the cylindrical portion 21. The through holes 27 may be formed in even numbers, such as two, four, etc., so as to oppose each other. By comprising in this way, gas can be quickly discharged | emitted, without making the gas produced in the internal space 40 of the cylindrical part 21 remain. Further, after the gas is discharged, the through hole 27 formed at a predetermined location is closed with the sealing member 29, thereby preventing a change in optical characteristics such as a refractive index due to the gas and a curing failure of the adhesive. Furthermore, by forming the position of the through hole 27 on the bottom 25 side of the photoelectric conversion element package mounting hole 23, it is possible to prevent the through hole 27 from being blocked by the adhesive when the photoelectric conversion element package 5 is bonded, and to release the gas to the outside. The discharge can be performed effectively.

  The present invention is not limited to the first and second embodiments described above, and various modifications can be made within the scope of the technical idea of the present invention. For example, the right end face 22 of the photoelectric conversion element package mounting hole 23 of the optical module 1 may be fixed to the substrate on which the photoelectric conversion element is mounted with an adhesive to make a connection between the optical transmission line and the photoelectric conversion element.

  Further, four or more recesses 26 in the first embodiment may be formed in consideration of the amount of adhesive in fixing between the cylindrical portion 21 and the photoelectric conversion element package 5.

It is a longitudinal cross-sectional view of the holder which comprises the optical module which concerns on embodiment of this invention, and is sectional drawing cut | disconnected and shown along the CC line of FIG. It is a figure which shows the optical module which concerns on embodiment of this invention, Comprising: It is a longitudinal cross-sectional view which shows the state which attached the ferrule to the holder. FIG. 3A is a diagram showing an optical module according to an embodiment of the present invention, and is a longitudinal section schematically showing a state in which a ferrule and a photoelectric conversion element package are attached to a holder and a through hole is opened. FIG. FIG. 3B is a diagram illustrating the optical module according to the embodiment of the present invention, in which the ferrule and the photoelectric conversion element package are attached to the holder, and the through hole is closed with a sealing member. It is a longitudinal cross-sectional view which shows a state typically. It is sectional drawing which expands and shows a part (sleeve diameter 2 step | paragraph shape) of the holder of FIG. It is the figure seen from the A direction of FIG. 1, and is the one end side side view of a holder. It is the figure seen from the B direction of FIG. 1, and is the other end side side view of a holder. It is a figure which shows the coupling efficiency in case a predetermined force acts on a ferrule, and the coupling efficiency in the case where a predetermined force does not act on a ferrule by comparing this invention product with a comparative example. It is a longitudinal cross-sectional view of the optical module which shows a comparative example. It is a figure which shows simply the optical connector which uses the optical module of this invention. It is a longitudinal cross-sectional view of the sleeve for optical connectors which shows a prior art example. It is a figure which shows the malfunction occurrence state of the sleeve for optical connectors of a prior art example.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Optical module, 2 ... Holder, 3 ... Ferrule, 5 ... Photoelectric conversion element package, 6 ... End part mounting hole, 7 ... Opening part, 8 ... Hole bottom, 10 ... Mating guide Part 11 ...... first hole part 13 ...... second hole part 21 ...... cylindrical part 26 ...... recessed part 27 ...... through hole 29 …… sealing member 30 …… aspherical lens ( Lens), 36 ... Housing, 37 ... Connector, 40 ... Internal space, 41 ... External space, CL ... Axis

Claims (2)

An end of the optical transmission path is fitted into an end mounting hole on one end side in the axial direction of the holder, a photoelectric conversion element package is engaged in a cylindrical portion on the other end side in the axial direction of the holder, and the end of the holder A lens projecting toward the photoelectric conversion element package is disposed between the part mounting hole and the cylindrical part, and the optical transmission path and the photoelectric conversion element package are optically coupled via the lens. In the module
The end mounting hole has a fitting guide portion having a tapered hole shape in which the diameter of the hole gradually decreases toward the hole bottom in order from the opening side to the hole bottom side, and the bottom side of the fitting guide portion. A first hole located in the first hole, and a second hole that is smaller in diameter than the first hole and located on the bottom side of the hole and fits on the distal end side of the end of the optical transmission path,
The photoelectric conversion element package emits light from a semiconductor light emitting element,
In the cylindrical portion, the photoelectric conversion element package is housed so that an internal space is generated between the lens and the photoelectric conversion element package is bonded and fixed with an adhesive,
Forming a through-hole in the cylindrical portion that communicates the internal space between the photoelectric conversion element package and the lens and the external space of the cylindrical portion;
Gas that is generated from the adhesive and that changes the refractive index of light is transmitted from the internal space between the photoelectric conversion element package and the lens through the through-hole formed in the cylindrical portion. To the outside space,
An optical module characterized by that. An optical connector comprising: the optical module according to claim 1; and a housing that accommodates and holds the optical module.

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