JP5282742B2 - Optical module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical module preventing shifting of a core portion of the optical module from the optical axis of an optical element, and fixing optical fibers with sufficient strength by an adhesive. <P>SOLUTION: The optical fiber 13 is inserted in an optical fiber insertion recess 7 of a main fixing member 3, passing through an adhesive containing portion 10 of an auxiliary fixing member 9. The adhesive 14 is filled in the adhesive containing portion 10, and the main fixing member 3, the auxiliary fixing member 9 and the optical fiber 13 are integrally bonded together. The optical fiber insertion recess 7 includes an optical fiber guide surface 7A inclined to reduce the inside diameter of a hole as approaching the optical element 2. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an optical module that optically couples an optical element and an optical fiber.

  In general, as an optical module, in order to optically couple an optical element and an optical fiber, the optical element and an optical cable end are fixed on a substrate with the optical fiber end facing the optical element. Is known (see, for example, Patent Document 1). At this time, the end portion of the optical cable is mounted in a V-shaped V-shaped groove provided on the substrate, and is fixed to the substrate using an adhesive and a pressing plate.

Japanese Patent Laid-Open No. 10-200353

  By the way, in the above-described prior art, the optical fiber is bonded to the V groove having a depth of about 1/3 of the outer diameter of the optical fiber by an adhesive. In this case, the contact area (adhesion between the optical fiber and the adhesive) (Area) cannot be secured sufficiently, and the optical fiber cannot be fixed to the substrate with sufficient strength by using only the adhesive. Therefore, in the above-described conventional technology, the optical fiber is fixed to the substrate using a pressing plate together with the adhesive.

  However, in this case, the number of parts is increased and the number of fixing operations is increased by the amount of the pressing plate required. As a result, there is a problem that the fixing work of the optical fiber becomes troublesome, the productivity is lowered, and the cost is increased.

  Further, in the above-described conventional technology, the positioning of the optical fiber is performed based on the contact between a part of the peripheral surface of the optical fiber and a part of the inner surface of the V-groove, so that the positioning accuracy cannot be sufficiently ensured. There is also a problem that the core of the optical fiber and the optical axis of the optical element are likely to be shifted.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to prevent the deviation between the core portion of the optical fiber and the optical axis of the optical element, and without using a pressing plate. It is an object of the present invention to provide an optical module that can fix an optical fiber with sufficient strength.

  In order to solve the above-described problems, an optical module according to the present invention is provided with an optical element that emits or receives an optical signal, and the optical element is provided so that the inner diameter of the hole decreases as the optical element is approached. An auxiliary device having a main fixing member provided with an optical fiber insertion recess having an optical fiber guide surface, an adhesive accommodating portion, and a main fixing member holding portion that holds the main fixing member adjacent to the adhesive accommodating portion. A fixing member; an optical fiber that is inserted through the adhesive accommodating portion of the auxiliary fixing member toward the optical fiber insertion recess of the main fixing member and has an end facing the optical element; the main fixing member and the auxiliary Assembling the fixing member, the optical fiber is inserted into the optical fiber insertion recess of the main fixing member through the adhesive receiving portion of the auxiliary fixing member, and the adhesive fixing portion is filled with the main fixing member. The auxiliary fixing member and the optical fiber has a configuration formed by a bonding agent for bonding together.

  According to a second aspect of the present invention, the main fixing member is provided with an engaging portion that engages with a main fixing member holding portion of the auxiliary fixing member.

  According to a third aspect of the present invention, the main fixing member, the auxiliary fixing member, and the optical fiber are integrally bonded in a state where the adhesive enters the optical fiber insertion recess.

  According to the first aspect of the present invention, the end of the optical fiber is inserted into the optical fiber insertion recess having the optical fiber guide surface inclined so that the inner diameter of the hole becomes smaller as the optical element is approached. By guiding the end portion of the fiber with the optical fiber guide surface, the core portion of the optical fiber and the optical axis of the optical element can be aligned. For this reason, it is possible to prevent a shift between the core portion of the optical fiber and the optical axis of the optical element, and to reduce the optical loss due to the positional shift of the optical axis.

  Further, since the optical fiber is bonded to the auxiliary fixing member by the adhesive filled in the adhesive accommodating portion through which the optical fiber passes, the peripheral surface of the optical fiber is covered with the adhesive filled in the adhesive accommodating portion and cured. It is possible to cover, and it is possible to secure an area (adhesion area) where the optical fiber and the adhesive are in contact with each other. For this reason, it is possible to secure the fixing strength of the optical fiber by the adhesive, and the fixing work required in the prior art is unnecessary, so that the fixing work can be easily performed, the productivity can be improved and the cost can be reduced. Can do.

  According to the invention of claim 2, since the main fixing member is provided with the engaging portion that engages with the main fixing member holding portion of the auxiliary fixing member, the main fixing member and the auxiliary fixing member are assembled. Thus, it is difficult to separate the main fixing member and the auxiliary fixing member. For this reason, the optical fiber insertion work and the adhesive filling work can be easily performed.

  According to the invention of claim 3, since the main fixing member, the auxiliary fixing member, and the optical fiber are bonded in a state where the adhesive enters the optical fiber insertion recess, the main fixing member and the auxiliary fixing member The fixing strength and the fixing strength between the main fixing member and the optical fiber can be secured.

1 is a perspective view showing an optical module according to a first embodiment of the present invention. It is a perspective view which shows the main fixing member which comprises an optical module. It is a perspective view which shows the auxiliary | assistant fixing member which comprises an optical module. It is the perspective view which looked at the auxiliary | assistant fixing member from the upper right side of FIG. It is a perspective view which shows the state before assembling a main fixing member and an auxiliary fixing member. It is a perspective view which shows the state which assembled the main fixing member and the auxiliary fixing member. It is a perspective view which shows the state before inserting the edge part of an optical fiber in the optical fiber insertion recessed part of a main fixing member after assembling a main fixing member and an auxiliary fixing member. It is a perspective view which shows the state which inserted the optical fiber end part into the optical fiber insertion recessed part of the main fixing member after assembling the main fixing member and the auxiliary fixing member. The figure which shows the state before filling the adhesive material accommodating part of an auxiliary | assistant fixing member, after assembling a main fixing member and an auxiliary | assistant fixing member and inserting the edge part of an optical fiber in the optical fiber insertion recessed part of the main fixing member. 8 is a plan view seen from the direction of arrows IX-IX in FIG. FIG. 1 shows a state in which the main fixing member and the auxiliary fixing member are assembled and the end portion of the optical fiber is inserted into the optical fiber insertion recess of the main fixing member, and then the adhesive accommodating portion of the auxiliary fixing member is filled with the adhesive. It is sectional drawing seen from the arrow XX direction. It is a perspective view which shows the state before attaching an optical module to a circuit board. It is a perspective view which shows the state which attached the optical module to the circuit board. It is a perspective view which shows the optical module by the 2nd Embodiment of this invention. It is a perspective view which shows the state before attaching an optical module to a circuit board. It is a perspective view which shows the state which attached the optical module to the circuit board. It is a perspective view similar to FIG. 4 which shows the auxiliary | assistant fixing member by the 1st modification of this invention. It is the same perspective view as FIG. 3 which looked at the auxiliary fixing member from the upper left side of FIG. It is a top view which shows the state before inserting the edge part of an optical fiber in the optical fiber insertion recessed part of a main fixing member, after assembling a main fixing member and an auxiliary fixing member. It is a top view similar to FIG. 18 which shows the optical module by the 2nd modification of this invention. It is a top view similar to FIG. 18 which shows the optical module by the 3rd modification of this invention.

  Hereinafter, a case where an optical module according to an embodiment of the present invention is applied to an optical transmission module will be described as an example with reference to the accompanying drawings.

  First, FIGS. 1 to 12 show a first embodiment of the present invention. In the figure, reference numeral 1 denotes an optical transmission module as an optical module. The optical transmission module 1 includes a light emitting element 2, a main fixing member 3, an auxiliary fixing member 9, an optical fiber 13, an adhesive 14 and the like which will be described later. .

  Reference numeral 2 denotes a light emitting element as an optical element. The light emitting element 2 is composed of, for example, a light emitting diode (LED), a laser diode (LD), a surface emitting laser diode (VCSEL), and the like, and emits an optical signal. Here, the light emitting element 2 is provided (mounted) on a main fixing member 3 described later.

  Reference numeral 3 denotes a main fixing member for mounting the light emitting element 2, and the main fixing member 3 includes, for example, a substrate 4, an electrode terminal 5, a resin member 6, an optical fiber insertion recess 7, an engagement recess as will be described later. It is comprised by the groove | channel 8 grade | etc.,.

  Reference numeral 4 denotes a substrate on which the light emitting element 2 is mounted, on which an electrode terminal 5 described later is formed. Here, the substrate 4 is formed in a rectangular flat plate shape having a thickness, for example, and the light emitting element 2 and the electrode terminal 5 are connected to each other in a state where the light emitting element 2 and the electrode terminal 5 are connected by a printed wiring or the like. It is fixed.

  Reference numeral 5 denotes a pair of electrode terminals fixed to the substrate 4. Each electrode terminal 5 protrudes upward from the upper surface of the substrate 4 in the state shown in FIG. Each of these electrode terminals 5 is joined to a spring terminal 19 of the circuit board 15 in a state where the optical transmission module 1 is attached to a circuit board 15 (see FIGS. 11 to 12) described later. The circuit provided in 15 and the light emitting element 2 are connected.

  6 is a resin member that covers the side surface of the substrate 4 to which the light emitting element 2 is fixed. The resin member 6 is formed in a rectangular parallelepiped shape that is thicker than the substrate 4, for example, and seals (embeds) the light emitting element 2. In this state, it is fixed to the side surface of the substrate 4. Here, the resin member 6 is formed using a resin material having translucency that transmits an optical signal of the light emitting element 2. Specifically, the resin member 6 is molded by pouring a resin material into the mold in a state where the substrate 4 on which the light emitting element 2 and the electrode terminals 5 are mounted is inserted into the mold prepared in advance. And fixed to the side surface of the substrate 4 without separation.

  Reference numeral 7 denotes an optical fiber insertion recess provided on the side of the resin member 6 opposite to the side fixed to the substrate 4. The optical fiber insertion recess 7 has an inner diameter of the hole that decreases as the light emitting element 2 is approached. It is formed as a conical concave bottomed hole having an optical fiber guide surface 7A inclined in the direction. The bottom surface 7B of the optical fiber insertion recess 7 is formed into a circular bottom surface 7B having substantially the same shape as an end surface of the optical fiber 13, which will be described later, that is, an outer diameter substantially the same as the outer diameter of the optical fiber 13.

  Further, the center of the bottom surface 7B of the optical fiber insertion recess 7 is aligned with the optical axis of the light emitting element 2, and the end of the optical fiber 13 extends to the back of the optical fiber insertion recess 7 (for example, the end surface of the optical fiber 13). In this state, the center (core portion) of the optical fiber 13 and the optical axis of the light emitting element 4 are aligned. Thereby, the bottom surface 7 </ b> B constitutes an optical fiber positioning portion that positions the end portion of the optical fiber 13.

  8 is a pair of engaging portions provided on each outer surface of the resin member 6 (the outer surface in the width direction of the resin member 6, for example, the left side surface and the right side surface in the left and right directions in the state shown in FIG. 2). The engaging grooves 8 are formed in parallel with each other with a quadrangular cross section. Here, each engaging concave groove 8 engages with each guide convex portion 11B provided on the auxiliary fixing member 9 when the main fixing member 3 is assembled to the auxiliary fixing member 9 described later, thereby fixing the main fixing member 3 to the main fixing member 9. While positioning the member 3 and the auxiliary fixing member 9, the main fixing member 3 and the auxiliary fixing member 9 are not easily separated.

  Reference numeral 9 denotes an auxiliary fixing member to which the main fixing member 3 is attached. The auxiliary fixing member 9 is formed using, for example, a resin material. For example, as shown in FIG. The fixing member holding portion 11 and the engaging convex portion 12 are configured.

  Reference numeral 10 denotes an adhesive accommodating portion for filling an adhesive 14 to be described later. The adhesive accommodating portion 10 is formed as a bottomed concave portion whose upper side is opened in the state shown in FIG. 3, for example. That is, the adhesive accommodating portion 10 includes a rectangular bottom plate portion 10A and a frame plate portion 10B provided so as to surround the four sides of the bottom plate portion 10A. A space surrounded by the frame plate portion 10B on the upper side of the bottom plate portion 10A is used as an adhesive material accommodation space 10C for containing (filling) an adhesive 14 described later.

  The frame plate portion 10B is formed with a pair of through holes 10D concentrically at positions facing each other with the adhesive material accommodation space 10C interposed therebetween. In each of these through holes 10D, an optical fiber 13 to be described later is formed. Is inserted. That is, the optical fiber 13 passes through the adhesive accommodating space 10C and is inserted into each through hole 10D in a state of being spanned over each through hole 10D.

  Moreover, the height of the part (opposing part 10B1) which opposes the resin member 6 which comprises the main fixing member 3 among the frame board parts 10B is made lower than the height of another part. More specifically, as shown in FIG. 6, the height of the facing portion 10B1 is set such that a part of the opening of the optical fiber insertion recess 7 is exposed in a state where the main fixing member 3 is assembled to the auxiliary fixing member 9. The height is set. And when putting the below-mentioned adhesive 14 in 10 C of adhesive agent accommodation spaces, this adhesive agent 14 also enters into the optical fiber insertion recessed part 7. FIG.

  Reference numeral 11 denotes a main fixing member holding portion for mounting the main fixing member 3 on the auxiliary fixing member 9. The main fixing member holding portion 11 holds the main fixing member 3 adjacent to the adhesive accommodating portion 10. is there. Here, the main fixing member holding portion 11 is provided at a position opposite to the adhesive accommodating space 10 </ b> C across the facing portion 10 </ b> B <b> 1 of the frame plate portion 10 </ b> B constituting the adhesive accommodating portion 10. 11 </ b> A, a pair of guide convex portions 11 </ b> B that engage with the respective engaging concave grooves 8 of the main fixing member 3, and the like.

  In the state where the main fixing member 3 is assembled to the auxiliary fixing member 9, the main fixing member 3 is provided on the main fixing member 3 by the engagement between the guide convex portion 11 </ b> B of the auxiliary fixing member 9 and the engaging groove 8 of the main fixing member 3. The optical axis of the light emitting element 2 and the central axis of each through hole 10D of the auxiliary fixing member 9 are made to coincide.

  Reference numeral 12 denotes a pair of engaging convex portions that engage with a concave portion 18A provided on the circuit board 15 in a state where the optical transmission module 1 is attached to a circuit board 15 (see FIGS. 11 to 12) described later. The engaging projections 12 are formed on the outer surfaces of the auxiliary fixing member 9 (the outer surfaces in the width direction of the auxiliary fixing member 9, for example, the upper side and the lower side in the upper and lower directions in the state shown in FIG. 9). They are provided in parallel with each other so as to protrude from the side surface. Here, each engagement convex portion 12 is formed to have a semicircular cross section and to extend in an arrangement direction of an optical fiber 13 to be described later (for example, left and right in the state shown in FIG. 11). .

  An optical fiber 13 transmits an optical signal. The optical fiber 13 is inserted into the optical fiber insertion recess 7 of the main fixing member 3 through the adhesive accommodating portion 10 of the auxiliary fixing member 9. Here, in the state where the optical fiber 13 is inserted to the back of the optical fiber insertion recess 7, for example, the end of the optical fiber 13 abuts (closely contacts) the bottom surface 7 </ b> B of the optical fiber insertion recess 7, and the main fixing is performed. It faces the light emitting element 2 provided on the member 3.

  14 is an adhesive for integrally bonding the main fixing member 3, the auxiliary fixing member 9, and the optical fiber 13, and the adhesive 14 has translucency for transmitting an optical signal, for example, an epoxy resin system, It is composed of an adhesive such as a silicone resin. Here, the adhesive 14 assembles the main fixing member 3 to the auxiliary fixing member 9 as shown in FIGS. 5 to 6, and further bonds the optical fiber 13 to the auxiliary fixing member 9 as shown in FIGS. 7 to 8. As shown in FIGS. 1 and 10, the adhesive container 10 is filled with the adhesive container 10 inserted into the optical fiber insertion recess 7 of the main fixing member 3 through the agent container 10. Then, after the filling, the adhesive 14 is cured, whereby the main fixing member 3, the auxiliary fixing member 9, and the optical fiber 13 are bonded (fixed) together.

  Next, an assembly procedure (manufacturing method) of the optical transmission module 1 will be described.

  First, as shown in FIG. 5, the main fixing member 3 is opposed to the main fixing member holding portion 11 of the auxiliary fixing member 9. Then, as shown in FIG. 6, the main fixing member 3 is engaged with the guide projection 11 </ b> B of the auxiliary fixing member 9 while the main fixing member 3 is engaged with the main fixing member holding portion of the auxiliary fixing member 9. 11 is assembled. At this time, the central axis of each through hole 10D provided in the frame plate portion 10B constituting the auxiliary fixing member 9, the central axis of the optical fiber insertion recess 7, and the optical axis of the light emitting element 2 are positioned in a straight line.

  Next, as shown in FIG. 7, the end portion of the optical fiber 13 is opposed to the through hole 10 </ b> D provided in the auxiliary fixing member 9. Then, as shown in FIG. 8, the optical fiber 13 is inserted into the optical fiber insertion recess 7 of the main fixing member 3 through the adhesive accommodating portion 10 of the auxiliary fixing member 3. At this time, the end of the optical fiber 13 is inserted to the back of the optical fiber insertion recess 7 while being guided by the guide surface 7A of the optical fiber insertion recess 7, and for example, as shown in FIG. 13 end faces the bottom surface 7B of the optical fiber insertion recess 7.

  Next, as shown in FIG. 1, the adhesive 14 is put in the adhesive accommodating portion 10 of the auxiliary fixing member 9 at least until the optical fiber 13 is immersed (for example, the outer peripheral surface of the optical fiber 13 is covered by the adhesive 14 over the entire circumference). More preferably, it is inserted (filled) to a position higher than the facing portion 10B1 of the frame plate portion 10B constituting the adhesive accommodating portion 10. At this time, as shown in FIG. 10, the adhesive 14 enters the optical fiber insertion recess 7 from a portion of the opening of the optical fiber insertion recess 7 exposed above the facing portion 10B1 of the frame plate portion 10B. When the adhesive 14 is cured, the main fixing member 3, the auxiliary fixing member 9, and the optical fiber 13 are bonded to complete the optical transmission module 1.

  Next, the circuit board 15 to which the optical transmission module 1 is attached will be described with reference to FIGS.

  Reference numeral 15 denotes a circuit board to which the optical transmission module 1 is attached. The circuit board 15 includes a substrate 16, a resin package 17, an attachment portion 18, a spring terminal 19 and the like which will be described later.

  Reference numeral 16 denotes a substrate on which a circuit is mounted (wiring is provided), and the substrate 16 is formed in a rectangular flat plate shape having a thickness, for example. Further, for example, a circuit (not shown) for driving the light emitting element 2 is provided on the upper surface (upper surface 16A) of the substrate 16 in the state shown in FIG. 11, for sealing the circuit with resin. A resin package 17 described later is fixed. In addition, a spring terminal 19 described later is provided on a portion of the substrate 16 exposed from the resin package 17. On the other hand, the back side surface (lower surface 16B) of the substrate 16 is provided with electrodes for surface-mounting the circuit board 15 on a mother board (not shown), for example.

  Reference numeral 17 denotes a resin package in which a circuit is sealed. The resin package 17 is fixed to the upper surface 16 </ b> A of the substrate 16. Specifically, the resin package 17 is molded by pouring a resin material into the mold in a state where the substrate 16 is inserted into a mold prepared in advance, and is firmly fixed to the upper surface 16A of the substrate 16. Has been.

  Reference numeral 18 denotes an attachment portion for attaching the optical transmission module 1 to the circuit board 15. The attachment portion 18 is a portion of the upper surface 16 A of the substrate 16 that is not covered with the resin package 17, that is, of the upper surface 16 A of the substrate 16. A portion exposed from the resin package 17 (exposed portion 16C) and a pair of side surfaces 17A facing each other across the exposed portion 16C of the resin package 17 are configured.

  Each side surface 17 </ b> A is provided with a pair of recesses 18 </ b> A that engage with the engagement protrusions 12 provided on the auxiliary fixing member 9 of the optical transmission module 1. Each of these recesses 18 </ b> A is formed in parallel with each other with the same semicircular cross section as each of the engagement protrusions 12. Moreover, the length dimension of each recessed part 18A is made the same as the length dimension of each engaging convex part 12. FIG. Then, the optical transmission module 1 is fixed to the mounting portion 18 of the circuit board 15 based on the engagement between the concave portions 18 </ b> A and the engaging convex portions 12.

  Reference numeral 19 denotes a spring terminal provided on the exposed portion 16C exposed from the resin package 17 in the upper surface 16A of the substrate 16, and the spring terminal 19 attaches the optical transmission module 1 to the mounting portion of the circuit board 15 as shown in FIG. In the state where it is attached to 18, it is joined to the electrode terminal 5 of the optical transmission module 1 to connect the light emitting element 2 of the optical transmission module 1 and the circuit of the circuit board 15.

The optical transmission module 1 according to the present embodiment has the above-described configuration, and the operation thereof will be described next.

  When the light emitting element 2 emits an optical signal based on the drive current supplied from the circuit board 15 or the like to which the optical transmission module 1 is attached, the optical signal is transmitted through the core portion of the optical fiber 13 facing the light emitting element 2. Is done.

  Here, in this embodiment, the end portion of the optical fiber 13 is inserted into the optical fiber insertion recess 7 having the optical fiber guide surface 7A inclined so that the inner diameter of the hole becomes smaller as it approaches the light emitting element 2. The core portion of the optical fiber 13 and the optical axis of the light emitting element 2 can be aligned. That is, when the optical fiber 13 is inserted into the optical fiber insertion recess 7, the end of the optical fiber 13 is guided by the optical fiber guide surface 7 </ b> A and enters the inner portion of the optical fiber insertion recess 7. In this state, the end surface of the optical fiber 13 is in contact with the bottom surface 7B of the optical fiber insertion recess 7 having the same shape as this end surface and the center of which coincides with the optical axis of the light emitting element 2. For this reason, the core part of the optical fiber 13 and the optical axis of the light emitting element 2 can be reliably aligned, and a shift between the core part of the optical fiber 13 and the optical axis of the light emitting element 2 can be prevented. As a result, it is possible to reduce the optical loss accompanying the positional deviation of the optical axis.

  In this embodiment, since the optical fiber 13 is bonded to the auxiliary fixing member 9 by the adhesive 14 filled in the adhesive accommodating portion 10 through which the optical fiber 13 passes, the adhesive accommodating portion 10 is filled. The outer peripheral surface of the optical fiber 13 can be covered over with the adhesive 14 that hardens. For this reason, the area (adhesion area) where the optical fiber 13 and the adhesive 14 contact can be secured, and the fixing strength of the optical fiber 13 by the adhesive 14 can be secured. As a result, the fixing work required in the prior art becomes unnecessary, so that the fixing work can be easily performed, the productivity can be improved, and the cost can be reduced.

  In the present embodiment, the main fixing member 3 is assembled to the auxiliary fixing member 9, and the guide convex portion 11 </ b> B provided on the main fixing member holding portion 11 of the auxiliary fixing member 9 and the main fixing member 3 are provided. Since the engaging projections 12 are engaged, it is difficult to separate the main fixing member 3 and the auxiliary fixing member 9 from each other. For this reason, the insertion operation of the optical fiber 13 and the filling operation of the adhesive 14 can be easily performed.

  Further, in the present embodiment, the main fixing member 3, the auxiliary fixing member 9 and the optical fiber 13 are bonded together with the adhesive 14 entering the optical fiber insertion recess 7. The fixing strength between the member 9 and the fixing strength between the main fixing member 3 and the optical fiber 13 can be secured.

  Next, FIGS. 13 to 15 show a second embodiment of the present invention. The feature of this embodiment is that a holding portion is provided on the auxiliary fixing member. In the present embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  In the figure, 21 is an optical transmission module according to the present embodiment, and the optical transmission module 21 includes a light emitting element 2, a main fixing member 3, an auxiliary fixing member 22, an optical fiber 13, an adhesive 14, and the like.

  Reference numeral 22 denotes an auxiliary fixing member to which the main fixing member 3 is attached. The auxiliary fixing member 22 includes an adhesive accommodating portion 10 for filling the adhesive 14, a main fixing member holding portion 23, a gripping portion 24, and a concave portion 25, which will be described later. Etc.

  Reference numeral 23 denotes a main fixing member holding portion for mounting the main fixing member 3 on the auxiliary fixing member 22. The main fixing member holding portion 23 holds the main fixing member 3 adjacent to the adhesive accommodating portion 10. is there. Here, the main fixing member holding portion 23 is formed as a fitting recess into which the main fixing member 3 is fitted without rattling. Further, in a state where the main fixing member 3 is fitted in the main fixing member holding portion 23, a notch is formed, for example, in a portion on the upper side in the state shown in FIG. 13 so that the electrode terminal 5 of the main fixing member 3 is exposed. A portion 23A is provided.

  Reference numeral 24 denotes a gripping portion for making it easy to grip the auxiliary fixing member 22 by hand. The gripping portion 24 is formed in a rectangular flat plate shape having a thickness, and the outer side surface of the auxiliary fixing member 22 (of the auxiliary fixing member 22). It is formed to extend outward from the outer surface in the width direction.

  Reference numeral 25 denotes a pair of recesses that are engaged with an engagement projection 27 provided on a circuit board 26 (see FIGS. 14 to 15), which will be described later. 22 are provided in parallel to each other in a state of being recessed from the respective outer surfaces on the opposite side to the outer surface on which the grip portion 24 is provided. Here, each recessed part 25 is formed so that it may be extended in the arrangement | positioning direction of the optical fiber 13 while it is formed in a semicircular cross section.

  Next, the circuit board 26 to which the optical transmission module 21 is attached will be described with reference to FIGS.

  Reference numeral 26 denotes a circuit board to which the optical transmission module 21 is attached. The circuit board 26 includes a substrate 16, a resin package 17, an attachment portion 28, a spring terminal 19, and the like.

  Reference numeral 28 denotes an attachment portion for attaching the optical transmission module 21 to the circuit board 26. The attachment portion 28 is a portion of the upper surface 16A of the substrate 16 that is not covered with the resin package 17, that is, of the upper surface 16A of the substrate 16. A portion exposed from the resin package 17 (exposed portion 16C), a step portion 17B formed on the upper surface of the resin package 17, and a pair of side surfaces 17A facing each other across the step portion 17B and the exposed portion 16C. doing.

  Further, on each side surface 17A of the resin package 17, an engagement convex portion 27 that engages with the concave portion 25 provided on the auxiliary fixing member 22 of the optical transmission module 21 is provided. Each of these engaging convex portions 27 is formed in parallel with each other in the same semicircular cross section as each concave portion 25. Moreover, the length dimension of each engagement convex part 27 is made the same as the length dimension of each concave part 25. Then, the optical transmission module 21 is fixed to the mounting portion 28 of the circuit board 26 based on the engagement between the engagement protrusions 27 and the recesses 25.

  In the optical transmission module 21 according to the present embodiment, the main fixing member 3 is assembled to the auxiliary fixing member 22 as described above, and the optical fiber 13 passes through the adhesive accommodating portion 10 of the auxiliary fixing member 22 and the optical fiber of the main fixing member 3. The auxiliary fixing member 22, the main fixing member 3, and the optical fiber 13 are bonded together by filling the adhesive container 10 with the adhesive 14 in the state of being inserted into the insertion recess 7. Therefore, also in this embodiment, it is possible to obtain the same function and effect as those of the first embodiment described above.

  In addition, in the second embodiment, since the auxiliary fixing member 22 is provided with the grip portion 24, the handleability (easy handling) of the optical transmission module 21 which is an assembly of the auxiliary fixing member 22 and the main fixing member 3 is adopted. Can be secured.

  In each of the above-described embodiments, the case where the inner side surfaces facing each other with the optical fiber 13 in between in the frame plate portion 10B constituting the adhesive accommodating portion 10 is described as an example. However, the present invention is not limited to this. For example, as shown in FIGS. 16 to 17, the inner side surfaces 31 opposed to each other with the optical fiber 13 interposed therebetween in the frame plate portion 10 </ b> B constituting the adhesive accommodating portion 10. Further, it may be configured to be inclined so as to approach the light emitting element 2.

  In the first embodiment described above, the bottom of the engaging groove 8 of the main fixing member 3 and the top of the guide convex portion 11B of the main fixing member holding portion 11 constituting the auxiliary fixing member 9 are flat surfaces. The case has been described as an example. However, the present invention is not limited to this. For example, as shown in FIG. 19, a claw portion 32 is provided at the tip of the guide convex portion 11B of the main fixing member holding portion 11 constituting the auxiliary fixing member 9, and the main fixing is performed. It is good also as a structure which provides the latching recessed part 33 which latches this nail | claw part 32 in the engagement ditch | groove 8 of the member 3. FIG.

  Further, in each of the above-described embodiments, the case where the entire inner surface of the optical fiber insertion recess 7 is inclined and the entire inner surface is used as the optical fiber guide surface 7A has been described as an example. However, the present invention is not limited to this. For example, as shown in FIG. 20, a cylindrical surface portion 34 as an optical fiber positioning portion may be provided at the back of the optical fiber insertion recess 7. In this case, the inner diameter of the cylindrical surface portion 34 is set to a size (for example, the same as the outer diameter of the optical fiber) that allows the optical fiber 13 to be fitted without rattling.

  In each of the above-described embodiments, the case where the optical module is applied to the optical transmission modules 1 and 21 has been described as an example. However, the present invention is not limited to this, and may be applied to an optical receiving module that receives an optical signal from an optical fiber using a light receiving element. In this case, the optical element is constituted by a light receiving element such as a photodiode (PD) or a phototransistor.

  Further, in each of the above-described embodiments, the case where the adhesive 14 having translucency that transmits an optical signal is used has been described as an example. However, the present invention is not limited to this. An adhesive having no translucency can also be used as long as the adhesive can be prevented from entering between the end surface and the bottom surface of the optical fiber insertion recess.

  Moreover, in each embodiment mentioned above, the case where the resin member 6 which comprises the main fixing member 3 was formed using the resin material with the translucency which permeate | transmits an optical signal was mentioned as an example, and was demonstrated. However, the present invention is not limited to this. For example, a resin material that does not have translucency is used as long as a gap or the like that enables optical coupling can be formed between the end of the optical fiber and the optical element. You can also.

  Further, in each of the above-described embodiments, the case where the light-emitting element 2 is surface-mounted on the substrate 4 has been described as an example. However, the present invention is not limited to this, and for example, wiring from the optical element to the substrate by bonding wires And it is good also as a structure which seals this bonding wire to a resin member with an optical element.

1,21 Optical transmitter module (optical module)
2 Light emitting element (optical element)
3 Main fixing member 7 Optical fiber insertion recess 7A Optical fiber guide surface 8 Engaging groove (engaging portion)
9, 22 Auxiliary fixing member 10 Adhesive accommodating portion 11, 23 Main fixing member holding portion 13 Optical fiber 14 Adhesive 24 Holding portion

Claims (3)

An optical element that emits or receives an optical signal; and
A main fixing member provided with an optical fiber insertion recess having an optical fiber guide surface inclined so that the inner diameter of the hole becomes smaller as the optical element is provided and approaches the optical element;
An auxiliary fixing member having an adhesive container and a main fixing member holding part for holding the main fixing member adjacent to the adhesive container;
An optical fiber that is inserted toward the optical fiber insertion recess of the main fixing member through the adhesive accommodating portion of the auxiliary fixing member, and has an end facing the optical element;
The main fixing member and the auxiliary fixing member are assembled, and the optical fiber is inserted into the optical fiber insertion recess of the main fixing member through the adhesive receiving portion of the auxiliary fixing member, and filled in the adhesive receiving portion. An optical module comprising an adhesive for integrally bonding the main fixing member, the auxiliary fixing member, and the optical fiber.   The optical module according to claim 1, wherein the main fixing member is provided with an engaging portion that engages with a main fixing member holding portion of the auxiliary fixing member.   3. The optical module according to claim 1, wherein the main fixing member, the auxiliary fixing member, and the optical fiber are integrally bonded in a state where the adhesive enters the optical fiber insertion recess.

Images