JP2018085397A - Optical module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical module capable of effectively suppressing deformation of a base part to which an optical component is fixed while effectively holding a housing space in which the optical component is accommodated moisture-proof.SOLUTION: An optical module 1 includes a plate member 10, an optical component fixed to the surface 10A of the plate member, and a lid member 70 that forms a housing space S accommodating the optical component together with the plate member. The plate member has a protrusion 12 that protrudes from the surface toward the lid member outside the housing space. A concave portion 76 formed so as to receive the protrusion in correspondence with the protrusion in the lid member. A sealing resin 90 that seals the housing space S is formed between the plate member and the lid member including a gap between the protrusion and the concave portion.SELECTED DRAWING: Figure 6

Description

  The present invention relates to an optical module, and more particularly to an optical module that emits laser light emitted from a semiconductor laser element through an optical fiber.

  Conventionally, a laser module 900 as shown in FIG. 1 is known as an optical module (see, for example, Patent Document 1). FIG. 1 is a front sectional view showing a laser module 900. As shown in FIG. 1, the laser module 900 includes a case 910 and a lid 920 that closes the case 910. Side walls 912 extend from the edge of the substrate 911 of the case 910. A concave portion 912 a is formed at the top of the side wall 912. On the other hand, a convex portion 920a that protrudes toward the side wall 912 is formed at the edge of the lid 920 corresponding to the concave portion 912a. Then, when such a convex portion 920 a is received in the concave portion 912 a, the lid 920 is placed on the side wall 912 of the case 910.

  A resin 930 is provided between the convex portion 920a and the concave portion 912a. The resin 930 seals the gap between the convex portion 920 a and the concave portion 912 a and fixes the lid 920 to the case 910. Between the case 910 and the lid 920, a semiconductor laser element 941 that emits laser light, an optical fiber 943, and optical coupling means 940 having lenses 942 and 944 that optically couple the laser light to the optical fiber 943 are provided. An accommodation space T for accommodating the optical component is formed. Such an optical component is fixed to the substrate 911 of the case 910 via an adhesive.

  Here, when moisture enters the accommodation space T, the adhesive fixing the optical component to the substrate 911 deteriorates due to hydrolysis, and the adhesive strength decreases. Moreover, the dew condensation occurs in the accommodation space T, so that the optical characteristics of the optical component are deteriorated. For this reason, as described above, the space between the case 910 and the lid 920 is sealed with the resin 930 to prevent moisture in the housing space T in which the optical component is housed. Means are sought.

  On the other hand, in the laser module 900 described above, for example, when the resin 930 that seals between the case 910 and the lid 920 absorbs moisture and expands, the case 910 is strongly pressed by the resin 930 and the case 910 is deformed. There is a problem that it ends up. When the case 910 is deformed in this manner, the position of the optical component fixed to the case 910 is shifted, the optical axis of the laser beam is shifted, and the optical characteristics of the laser module 900 are deteriorated.

  Thus, conventionally, there is a demand for an optical module that can effectively prevent deformation of the base (case) to which the optical component is fixed while effectively moisture-proofing the accommodation space T in which the optical component is accommodated. Has been.

JP2015-130394A

  The present invention has been made in view of such problems of the prior art, and effectively suppresses deformation of the base portion to which the optical component is fixed while effectively preventing moisture in the storage space in which the optical component is stored. An object of the present invention is to provide an optical module that can be used.

  According to one aspect of the present invention, there is provided an optical module that can effectively suppress deformation of a base portion to which an optical component is fixed while effectively moisture-proofing a storage space in which the optical component is stored. The optical module includes a base, an optical component that is fixed to the surface of the base, and a lid that forms a housing space that houses the optical component together with the base. The base has at least one protrusion that protrudes from the surface toward the lid on the outside of the housing space. The lid portion is provided with at least one concave portion formed to receive the at least one convex portion, corresponding to the at least one convex portion. A sealing resin for sealing the accommodation space is formed between the base and the lid including the gap between the convex and the concave corresponding to each other.

  According to such an optical module, since the convex part is received inside the concave part, the moisture passage path (moisture transmission path) is formed in an inverted U-shape, so that such convex part or concave part is formed. Compared to the case where the base is placed on the lid without doing so, a long moisture-permeable path can be secured. Then, by forming the sealing resin in a long moisture-permeable path including the gap between the convex portion and the concave portion, it is possible to prevent moisture from being transmitted over a long distance, and the optical component is accommodated. The housing space can be effectively moisture-proof.

  Moreover, since the sealing resin is provided between the convex part formed in the base and the concave part formed in the lid part, the force due to the expansion or contraction of the sealing resin is concentrated on the convex part. The forces due to the expansion or contraction of the sealing resin acting on the convex portions cancel each other. Therefore, even when the force due to the expansion or contraction of the sealing resin is concentrated on the convex portion, the convex portion is suppressed from being strongly pressed in a specific direction. Thus, since the part to which the optical component is fixed in the base is hardly subjected to the force due to the expansion or contraction of the sealing resin, the deformation of the base is effectively suppressed.

  The optical component may include an optical fiber, a semiconductor laser element capable of emitting laser light, and optical coupling means for coupling the laser light to the optical fiber. Thereby, it is possible to prevent the optical axis of the laser light emitted from the semiconductor laser element from being shifted due to the deformation of the base. In addition, since the housing space can be effectively moisture-proof as described above, generation of outgas can be suppressed, and end face destruction of the semiconductor laser element can be prevented.

  The at least one convex portion may be a single convex portion provided around the surface of the base portion. With such a configuration, the deformation of the base can be effectively suppressed, and the inside of the accommodation space can be more effectively moisture-proof.

  Further, the at least one convex portion may include a plurality of convex portions provided apart from each other. With such a configuration, the deformation of the base can be effectively suppressed, and the inside of the accommodation space can be more effectively moisture-proof. Moreover, compared with the case where a single convex part is provided around the surface of the base part, the stress caused by the expansion or contraction of the resin can be reduced.

  The lid portion may include at least one extension portion that extends toward the outside of the accommodation space. The recessed portion is formed in the extended portion. With such a configuration, the moisture permeation path can be made longer as compared with the case where the concave portion is formed on the side wall of the lid portion, so that the moisture-proof effect can be further enhanced. In addition, the thickness of the lid can be reduced.

  The base portion may include a substrate on which the optical component is placed and a wall portion extending from the substrate toward the lid portion. The convex portion is provided on the surface of the wall portion of the surface of the base portion. With such a configuration, even when the optical fiber is directly fixed to the base, it is possible to effectively suppress the deformation of the base.

  According to the present invention, since the convex portion is received inside the concave portion, the moisture passage route (moisture passage route) is formed in an inverted U shape, and thus a long moisture passage route can be secured. Then, by forming the sealing resin in a long moisture-permeable path including the gap between the convex portion and the concave portion, it is possible to prevent moisture from being transmitted over a long distance, and the optical component is accommodated. The housing space can be effectively moisture-proof. Further, since the sealing resin is formed between the convex portion and the concave portion, the force due to the expansion or contraction of the sealing resin is concentrated on the convex portion, and the force concentrated on the convex portion is effectively offset. It will be. As a result, the convex portion is suppressed from being strongly pressed in a specific direction, and the base portion to which the optical component is fixed is prevented from being deformed.

It is a front sectional view showing a conventional optical module. It is a perspective view which shows the optical module in the 1st Embodiment of this invention. It is a front view which shows the optical module of FIG. It is a perspective view which shows the cover part of the optical module of FIG. FIG. 4 is a cross-sectional view taken along line AA in FIG. 3 showing the optical module in FIG. 2. FIG. 3 is a front sectional view showing the optical module of FIG. 2. It is a perspective view which shows the cap member of the optical module of FIG. It is a figure which expands and shows the boundary part vicinity of the base of the optical module of FIG. 2, and a cover part. It is a top view which shows the base of the optical module of FIG. 2, and is a figure which abbreviate | omits and shows an optical component. It is a bottom view of the cover part shown in FIG. It is a top view corresponding to FIG. 9A which shows the base of the optical module in the 2nd Embodiment of this invention. It is a bottom view corresponding to FIG. 9B which shows the cover part of the optical module in the 2nd Embodiment of this invention. It is sectional drawing corresponding to FIG. 6 which shows the optical module in the 3rd Embodiment of this invention typically. It is sectional drawing corresponding to FIG. 6 which shows the optical module in the 4th Embodiment of this invention typically.

  Hereinafter, embodiments of the optical module according to the present invention will be described in detail with reference to FIGS. 2 to 12, the same or corresponding components are denoted by the same reference numerals, and redundant description is omitted. Further, in FIGS. 2 to 12, the scale and dimensions of each component are exaggerated, and some components may be omitted. In the following, a laser module using a semiconductor laser element is described as an example of the optical module according to the present invention, but the present invention can also be applied to an optical module using optical components other than the semiconductor laser element. .

  FIG. 2 is a perspective view showing the optical module 1 according to the first embodiment of the present invention, and FIG. 3 is a front view showing the optical module 1 of FIG. As shown in FIGS. 2 and 3, the optical module 1 includes a rectangular plate-like member 10 (base portion) that is long in the Z direction, and a lid member 70 (lid portion) placed on the plate-like member 10. ing. The plate-like member 10 can be placed on a heat sink or the like (not shown).

  4 is a perspective view showing the lid member 70, FIG. 5 is a sectional view taken along the line AA of FIG. 3 showing the optical module 1, and FIG. 6 is a front sectional view showing the optical module 1. As shown in FIGS. 4 to 6, the lid member 70 includes an upper wall 71 having the same outer shape and dimensions as the plate-like member 10, and four side walls extending from the edge of the upper wall 71 toward the plate-like member 10. 72A-72D. 4 and 5, an opening 74 is formed in the side wall 72A located on the + Z direction side among the four side walls 72A to 72D, and an optical fiber 51 (to be described later) passes through the opening 74. Ferrule 52) extends.

  As shown in FIG. 6, an accommodation space S is formed between the plate-like member 10 and the lid member 70. A convex portion 12 that protrudes toward the lid member 70 is formed on a portion of the surface 10 </ b> A of the plate-like member 10 that is located outside the accommodation space S. That is, the plate-like member 10 includes a convex portion 12 and a main body portion 16 to which an optical component described later is fixed. On the other hand, in the side walls 72 </ b> A to 72 </ b> D of the lid member 70, a concave portion 76 is formed so as to receive the convex portion 12 corresponding to the convex portion 12. Then, when the convex portion 12 is received in the concave portion 76, the lid member 70 is placed on the main body portion 16 of the plate-like member 10. A sealing resin 90 made of a material having low moisture permeability is formed in the gap between the convex portion 12 and the concave portion 76. The convex portion 12, the concave portion 76, and the sealing resin 90 will be described in detail later.

  As shown in FIGS. 5 and 6, the optical component is accommodated in the accommodation space S. Such an optical component includes a plurality of semiconductor laser elements 20, an optical fiber 51 covered with a ferrule 52, and an optical coupling means 80 that optically couples laser light emitted from the plurality of semiconductor laser elements 20 to the optical fiber 51. Including. The optical coupling means 80 includes a first collimating lens 30, a second collimating lens 32, a light propagation direction changing member 34, a first condensing lens 60, and a second condensing lens 62. Yes.

  The semiconductor laser element 20 and the optical coupling means 80 are fixed to the surface 10A of the plate-like member 10 (main body portion 16) via an adhesive. The optical fiber 51 (ferrule 52) is fixed to the ferrule fixing portion 53. And this ferrule fixing | fixed part 53 is being fixed to 10 A of surfaces of the plate-shaped member 10 with the adhesive material. That is, the optical fiber 51 (ferrule 52) is fixed to the surface 10A of the plate member 10 (main body portion 16) via the ferrule fixing portion 53. On the other hand, as shown in FIG. 6, such an optical component is not provided on the lid member 70.

  Returning to FIG. 4, an opening 74 extending upward from the lower end of the side wall 72 </ b> A is formed in the side wall 72 </ b> A of the lid member 70. As shown in FIG. 5, the ferrule 52 (optical fiber 51) fixed to the ferrule fixing portion 53 extends outside the accommodation space S through the opening 74. The opening 74 is sealed by a cap member 40 that can be elastically deformed.

  FIG. 7 is a perspective view showing such a cap member 40. As shown in FIG. 7, the cap member 40 includes a first portion 41 that can be fitted into the opening 74 of the side wall 72 </ b> A, and a second portion 42 that has an outer shape larger than the first portion 41. Is included. 2 and 5, the first portion 41 of the cap member 40 is fitted into the opening 74 of the side wall 72A, so that the second portion 42 of the cap member 40 is in close contact with the outer surface of the side wall 72A. It is in a state. The opening 74 is sealed by such a cap member 40.

  As shown in FIG. 7, the cap member 40 is formed with a ferrule insertion hole 43 having substantially the same diameter as the ferrule 52. As shown in FIGS. 5 and 6, the ferrule 52 passes through the ferrule insertion hole 43 and is fixed to the ferrule fixing portion 53 in the accommodation space S. With such a configuration, the optical fiber 51 (ferrule 52) is fixed to both the plate-like member 10 and the lid member 70. That is, the optical fiber 51 (ferrule 52) is fixed to the plate-like member 10 via the ferrule fixing portion 53 and is fixed to the lid member 70 via the cap member 40.

  Thus, the ferrule 52 (optical fiber 51) in the present embodiment is fixed to the plate member 10 via the ferrule fixing portion 53 and fixed to the lid member 70 via the cap member 40 capable of elastic deformation. Therefore, even if the lid member 70 is deformed, the position is prevented from shifting.

  As described above, on the surface 10 </ b> A of the plate-like member 10 (main body portion 16), laser light emitted from these semiconductor laser elements 20 is optically coupled to the optical fiber 51 corresponding to the plurality of semiconductor laser elements 20. The optical coupling means 80 is fixed. That is, the first collimating lens (first axis collimating lens) 30, the second collimating lens (slow axis collimating lens) 32, the light propagation direction changing member 34, and the first condensing lens 60 (first axis condensing lens). Lens) and the second condenser lens 62 (slow axis condenser lens) are fixed to the surface 10A of the plate member 10.

  By the way, the direction perpendicular to the pn junction of the semiconductor laser element 20 in the emitted light is referred to as the first axis, and the direction parallel to the pn junction is referred to as the slow axis. It is much larger than the degree of spread in the slow axis direction. For this reason, the laser light emitted from the semiconductor laser element 20 has a large spread in the fast axis direction. In the present embodiment, the fast axis direction of the laser light emitted from the semiconductor laser element 20 is the Y direction in FIG. 6, and the slow axis direction is the Z direction.

  As shown in FIG. 5, the first collimating lens 30, the second collimating lens 32, and the light propagation direction changing member 34 corresponding to a certain semiconductor laser element 20 have a position in the Z direction corresponding to the corresponding semiconductor laser. It arrange | positions so that it may become the same as the position of the element 20 in the Z direction. That is, in the present embodiment, a certain semiconductor laser element 20 and the first collimating lens 30, the second collimating lens 32, and the light propagation direction changing member 34 corresponding to the semiconductor laser element 20 are along the X direction. Arranged on a straight line.

  As shown in FIG. 5, each first collimating lens 30 is disposed adjacent to the corresponding semiconductor laser element 20. The first collimating lens 30 collimates the laser light emitted from the corresponding semiconductor laser element 20 and spreading in the first axis direction (Y direction) into parallel light. On the other hand, the second collimating lens 32 collimates the component in the slow axis direction (Z direction) out of the components of the laser light transmitted through the first collimating lens 30 into parallel light. As described above, since the laser light emitted from the semiconductor laser element 20 has a large spread in the first axis direction, the first collimating lens 30 for collimating the laser light spreading in the first axis direction is adjacent to the semiconductor laser element 20. Provided.

  As shown in FIG. 5, the light propagation direction changing members 34 are arranged with their positions shifted from each other at a predetermined pitch in the X direction. These light propagation direction changing members 34 change the propagation direction of the laser light transmitted through the first collimating lens 30 and the second collimating lens 32 using a pair of mirrors. In the present embodiment, the laser light incident on the light propagation direction changing member 34 along the X direction is changed in the Z direction by the light propagation direction changing member 34.

  Here, as shown in FIGS. 5 and 6, the optical module 1 includes a first condensing lens 60 that condenses the laser light emitted from the light propagation direction changing member 34 in the X direction, and a first condensing lens. And a second condensing lens 62 that condenses the laser light transmitted through the lens 60 in the Y direction. The first condenser lens 60 and the second condenser lens 62 reduce the laser light emitted from the light propagation direction changing member 34 to a beam size that can enter the optical fiber 51, and change the light propagation direction. It arrange | positions so that the laser beam emitted from the member 34 may be condensed toward the optical fiber 51 (namely, it will condense toward the edge part of the optical fiber 51).

  As described above, the plurality of light propagation direction changing members 34 are arranged with their positions shifted from each other at a predetermined pitch in the X direction. Therefore, the laser beams emitted from the plurality of semiconductor laser elements 20 are turned by 90 ° by the light propagation direction changing member 34, and the first laser lights are arranged at a predetermined pitch in the X direction without interfering with each other. The light enters the condenser lens 60.

  The first condenser lens 60 condenses the laser light in the X direction and has an optical axis along the Z direction. That is, the first condenser lens 60 condenses the laser light in the direction (X direction) along the first vertical axis perpendicular to the optical axis along the Z direction. The first condenser lens 60 is aligned in the X direction and is positioned with high accuracy in the X direction and the Z direction.

  The second condenser lens 62 condenses the laser light in the Y direction and has an optical axis along the Z direction. That is, the second condenser lens 62 condenses the laser light in a direction (Y direction) along the second vertical axis perpendicular to the optical axis along the Z direction. The second condenser lens 62 is aligned in the Y direction and is positioned with high accuracy in the Y direction and the Z direction.

  Therefore, the laser light that has passed through the first condenser lens 60 and the second condenser lens 62 is positioned with high accuracy in the X direction, the Y direction, and the Z direction, so that the end of the optical fiber 51 is positioned. It is condensed toward. As a result, the laser beam condensed toward the end of the optical fiber 51 is optically coupled with the end of the optical fiber 51, propagates through the optical fiber 51, and is emitted to the outside of the accommodation space S. As described above, the optical module 1 is configured as a multi-chip laser module capable of condensing the laser light emitted from the plurality of semiconductor laser elements 20 with the condensing lens and converting it into one output.

  As described above, the optical module 1 is configured to optically couple the optical components to the optical fiber 51 by keeping the paths (optical axes) of the plurality of laser beams constant by aligning optical components with high accuracy. In other words, in order to convert a plurality of laser beams into one output, it is necessary to keep the optical axes of the plurality of laser beams constant.

  However, if moisture or the like enters the accommodation space S, the resin (adhesive material) that fixes the optical component to the plate-like member 10 expands, and the position of the optical component shifts as the resin expands. . As a result, the optical axis of the laser beam is shifted, which adversely affects the output of the optical module. In addition, when moisture enters the storage space S, the adhesive absorbs moisture and the adhesive is hydrolyzed, thereby reducing the adhesive strength of the adhesive or causing condensation on the optical component. It is also conceivable that the optical characteristics of the optical module deteriorate. In particular, in the optical module 1 using the semiconductor laser element 20 as in the present embodiment, outgas is generated due to moisture that has entered the accommodation space S, and this outgas adheres to the end face of the semiconductor laser element 20. There is a possibility that end face destruction may occur in the semiconductor laser element 20. Therefore, in such an optical module, it is important to prevent moisture in the accommodation space S.

  8 is an enlarged view showing the vicinity of the boundary between the side wall 72B located on the −Z direction side of FIG. 6 and the plate member 10, FIG. 9A is a plan view showing the plate member 10, and FIG. 9B. FIG. 6 is a bottom view of the lid member 70. In FIG. 9A, the optical component fixed to the plate member 10 is not shown.

  As shown in FIG. 8, convex portions 12 extending upward (in the + Y direction) from the surface 10A are formed in the vicinity of the edge portion of the surface 10A of the plate-like member 10 (that is, outside the accommodation space S). As shown in FIG. 9A, the convex portion 12 is provided around the edge of the surface 10A. That is, the convex part 12 is formed as a single convex part provided around the edge of the surface 10 </ b> A of the plate-like member 10.

  On the other hand, as shown in FIG. 8, a recess 76 is provided on the bottom surface 73 of the side wall 72 </ b> B of the lid member 70 so as to receive the protrusion 12. As shown in FIG. 9B, the recess 76 extends over the entire circumference of the bottom surface 73 of the lid member 70 corresponding to the single protrusion 12 that is provided along the edge of the surface 10 </ b> A of the plate-like member 10. Is formed. That is, the recess 76 is formed as a single recess provided over the entire circumference of the bottom surface 73 of the lid member 70. As shown in FIGS. 6 and 8, the lid member 70 is placed on the plate-like member 10 when the convex portion 12 is received in the concave portion 76.

  As shown in FIG. 8, a sealing resin 90 is formed in the gap between the convex portion 12 and the concave portion 76 so as to seal this gap. As described above, the sealing resin 90 is formed from a material having low moisture permeability, and the sealing resin 90 is provided so as to cover the entire convex portion 12. That is, the sealing resin 90 made of a material with low moisture permeability is provided over the entire circumference of the convex portion 12. Further, as described above, the opening 74 of the lid member 70 is sealed by the cap member 40. As described above, the gap between the convex portion 12 and the concave portion 76 is sealed with the sealing resin 90, and the opening portion 74 is sealed with the cap member 40, so that the accommodation space S is substantially complete. It is sealed from the outside (see FIG. 6). Therefore, foreign matter such as dust or dust can be prevented from entering the housing space S.

  In addition, as shown in FIG. 8, since the convex portion 12 is received inside the concave portion 76, there is a moisture passage route (moisture permeable route) between the convex portion 12 and the concave portion 76. It is formed in an inverted U shape. That is, without forming such a concavo-convex structure, a long moisture-permeable path is formed as compared with the case where the surface 10A of the plate-like member 10 and the bottom surface 73 of the side wall 72B (lid member 70) are brought into contact with each other. . And since the sealing resin 90 is formed over the substantially full length of such a long moisture-permeable path | route, the inside of the storage space S can be moisture-proofed effectively. Moreover, if the sealing resin 90 is formed from a material having low moisture permeability, the housing space S can be more effectively moisture-proof. It is not always necessary to form the sealing resin 90 over the entire length of such an inverted U-shaped moisture permeation path, and a good moisture-proof effect can be obtained by forming it over a certain length.

  By the way, when the sealing resin 90 absorbs moisture or the temperature in the accommodation space S rises, the sealing resin 90 expands as indicated by a white arrow and a black arrow in FIG. Here, in the prior art shown in FIG. 1, when the resin 930 expands, the case 910 (base) to which the optical component is fixed is deformed by the expanding force of the resin 930, so that the optical axis shift of the laser light is shifted. Will occur. In particular, when the resin 930 is formed of a material having a high elastic modulus, the case 910 is strongly pressed when the resin 930 expands, and the case 910 is greatly deformed. As a result, the optical axis shift of the laser light is further increased. On the other hand, in this embodiment, even when the sealing resin 90 is formed of a material having a high elastic modulus, the deformation of the base (plate member 10) is suppressed. This point will be described in detail below.

  That is, as shown in FIG. 8, the sealing resin 90 includes the recess 76 formed on the bottom surface 73 of the lid member 70 (side walls 72 </ b> A to 72 </ b> D) and the interior of the side walls 72 </ b> A to 72 </ b> D from the surface 10 </ b> A of the plate-like member 10. That is, since it is provided between the convex portion 12 protruding into the concave portion 76), the force due to the expansion of the sealing resin 90 is caused by the expansion of the sealing resin 90 as shown by the white arrow and the black arrow in FIG. It will act on ~ 72D (lid member 70) in a concentrated manner.

  Thus, the force due to the expansion of the sealing resin 90 acts on the convex portion 12 in a concentrated manner. However, as shown in FIG. 8, the convex portion 12 is covered with the sealing resin 90 provided inside the concave portion 76, and therefore, due to the expansion of the sealing resin 90 as indicated by the black arrow in FIG. 8. The force is received from both the + Z direction side and the −Z direction side. That is, since the force acting on the convex portion 12 from the + Z direction side and the force acting on the −Z direction side cancel each other, the convex portion 12 is prevented from being strongly pressed in one of the + Z direction and the −Z direction. Is done. In other words, the main body portion 16 is suppressed from being strongly pressed in one of the + Z direction and the −Z direction.

  As described above, the force due to the expansion of the sealing resin 90 acts on the convex portion 12 and the forces acting on the convex portion 12 also cancel each other. The force due to the expansion of the body does not substantially act on the main body portion 16.

  As described above, since the force due to the expansion of the sealing resin 90 does not substantially act on the main body portion 16, it is possible to effectively suppress the deformation of the main body portion 16 even when the sealing resin 90 expands. Further, even when the sealing resin 90 is formed of a material having a high elastic modulus, the deformation of the main body portion 16 is suppressed. Therefore, as the material of the sealing resin 90, for example, the elastic modulus is high but the moisture permeability is low. The interior of the accommodation space S can be effectively moisture-proof using a material (having a high moisture-proof effect).

  By the way, as indicated by the white arrow in FIG. 8, since the force due to the expansion of the sealing resin 90 acts on the lid member 70, the lid member 70 may be deformed when the sealing resin 90 expands. . However, as shown in FIG. 6, the lid member 70 is not provided with an optical component. Further, as described above, since the cap member 40 that can be elastically deformed is interposed between the optical fiber 51 (ferrule 52) and the lid member 70, the cap member 40 even when the lid member 70 is deformed. Thus, the positional deviation of the optical fiber 51 is prevented. In other words, the influence of the deformation of the lid member 70 on the optical axis of the laser beam (that is, the optical system formed by the optical component) is reduced. Thus, according to the optical module 1, the optical axis shift of the laser light can be prevented without being affected by the deformation of the lid member 70.

  By the way, as shown to FIG. 9A, since the convex part 12 is formed in the surface 10A of the plate-shaped member 10 along the edge part of the surface 10A (in other words, as shown to FIG. 9B, a cover member) Since the concave portion 76 is formed on the entire bottom surface 73 of the bottom surface 73 of the 70, the sealing resin 90 can be provided using the convex portion 12 (or the concave portion 76) as a mark. That is, according to this embodiment, since the position where the sealing resin 90 is provided is clear, there is an advantage that the optical module 1 can be easily manufactured.

  In the above-described embodiment, as shown in FIG. 8, the convex portion 12 is located at the central portion in the Z direction of the concave portion 76, but the position in the concave portion 76 that is shifted from the central portion in the Z direction of the concave portion 76. Convex part 12 may be provided in.

  In the above-described embodiment, the optical fiber 51 (ferrule 52) is fixed to the lid member 70 via the cap member 40. However, the opening 74 can be sealed and the lid member 70 is The optical fiber 51 may be fixed to the lid member 70 with an arbitrary configuration as long as the position of the optical fiber 51 can be prevented from being shifted when it is deformed.

  In the above-described embodiments, the multi-chip laser module has been described as an example, but it goes without saying that the present invention can be used for other types of optical modules. For example, it can be used for a single chip laser module.

  Next, an optical module 100 according to a second embodiment of the present invention will be described. 10A is a plan view corresponding to FIG. 9A showing the plate-like member 10 of the optical module 100, and FIG. 10B is a bottom view corresponding to FIG. 9B showing the lid member 70 of the optical module 100.

  In the optical module 1 according to the first embodiment described above, the single convex portion 12 is provided over the entire circumference of the surface 10 </ b> A of the plate-like member 10, and the single concave portion 76 corresponding to this is provided on the lid member 70. Although provided over the entire circumference of the bottom surface 73 (see FIGS. 9A and 9B), in the optical module 100 according to the second embodiment, as shown in FIG. 10A, a plurality of convex portions (in the example shown in the drawing) Two convex portions 112, 112) are provided. Corresponding to this, as shown in FIG. 10B, a plurality of recesses (two recesses 176 and 176 in the illustrated example) are provided on the bottom surface 73 of the lid member 70.

  The clearance gap between the convex part 112 and the recessed part 176 is sealed with the sealing resin 90 similarly to the optical module 1 (refer FIG. 8). As shown in FIG. 10A, the sealing resin 90 is provided not only between the convex portion 112 and the concave portion 176 but also between the surface 10 </ b> A of the plate-like member 10 and the bottom surface 73 of the lid member 70. Yes. That is, the sealing resin 90 is provided along the entire circumference of the edge portion of the surface 10A. With such a configuration, the gap between the plate-like member 10 and the lid member 70 is sealed from the outside. Therefore, like the optical module 1, the inside of the accommodation space S can be effectively moisture-proof. Further, since the force due to the expansion of the sealing resin 90 is suppressed from being concentrated on the convex portion 112 at the portion where the convex portion 112 is not formed, the deformation of the plate-like member 10 is more effectively suppressed.

  Next, an optical module 200 according to a third embodiment of the present invention will be described. FIG. 11 is a front sectional view corresponding to FIG. 6 showing the optical module 200.

  As shown in FIG. 11, the optical module 200 includes a plate-like member 210 (base portion) and a lid member 270 (lid portion) placed on the plate-like member 210. Between the plate-like member 210 and the lid member 270, an accommodation space S in which an optical component is accommodated is formed. An optical component is fixed to the surface 210 </ b> A of the plate-like member 210. This optical component includes a single semiconductor laser element 20, optical coupling means 280 having lenses 260 and 262, and a ferrule 52 (optical fiber 51) placed on a ferrule fixing part 53. The ferrule 52 (the optical fiber 51) is fixed to the surface 210A of the plate-like member 210 via the ferrule fixing portion 53 and the lid member via the cap member 40, similarly to the optical module 1 and the optical module 100 described above. It is fixed to the side wall 272 of the 270. As described above, the optical module 200 is configured as a single chip laser module including the single semiconductor laser element 20.

  As shown in FIG. 11, a convex portion 212 that protrudes in the + Y direction from the surface 210 </ b> A is formed on the outside of the accommodation space S in the plate-like member 210. That is, the plate-like member 210 includes a main body portion 216 to which an optical component is fixed and a convex portion 212.

  As shown in FIG. 11, the lid member 270 includes an upper wall 271 located above (+ Y direction side) the optical component, a side wall 272 extending from the upper wall 271 toward the plate-like member 210, and a lower end portion of the side wall 272. And an expansion part 279 extending toward the outside of the accommodation space S. A concave portion 276 is formed in the extended portion 279 so as to receive the convex portion 212 corresponding to the convex portion 212. When the convex portion 212 is received in the concave portion 276, the lid member 270 is placed on the plate-like member 210.

  As shown in FIG. 11, a sealing resin 290 is provided in the gap between the convex portion 212 and the concave portion 276 so as to surround the convex portion 212. The sealing resin 290 seals the gap between the convex portion 212 and the concave portion 276. With such a configuration, the accommodation space S is sealed from the outside.

  According to such an optical module 200, instead of forming a recess in the side wall 272, the recess 276 can be formed in the extended portion 279 (that is, the recess 276 can be formed separately from the side wall 272). Therefore, a longer moisture-permeable path can be formed compared to the case where the concave portion is formed in the side wall 272, and the moisture-proof effect can be enhanced. In addition, since it is not necessary to secure a thickness for forming the concave portion in the side wall 272, the thickness of the side wall 272 can be reduced as compared with the optical module 1 or the optical module 100.

  When the convex portion 212 is not a single convex portion surrounding the accommodation space S, a sealing resin 290 is provided between the bottom surface 273 and the surface 210A in order to enhance the sealing effect of the accommodation space S. preferable.

  In the present embodiment, an example in which the optical module 200 is configured as a single chip laser module has been described. However, it goes without saying that the present embodiment can be applied to other types of optical modules.

  Next, an optical module 300 according to a fourth embodiment of the present invention will be described. FIG. 12 is a front sectional view corresponding to FIG. 6 showing the optical module 300.

  As shown in FIG. 12, the optical module 300 includes a base portion 310 and a lid portion 370 that forms an accommodation space S between the base portion 310. The base 310 includes a substrate 311 having an optical component fixed to the surface 311A thereof, and a wall portion 313 extending from the substrate 311 toward the lid portion 370. As shown in FIG. 12, the optical component of the optical module 300 includes a single semiconductor laser element 20, optical coupling means 380 having lenses 360 and 362, and an optical fiber 51 covered with a ferrule 52. . Unlike the optical module 1, the optical module 100, and the optical module 200 described above, the ferrule 52 (the optical fiber 51) is directly fixed to the wall portion 313 of the base portion 310. In addition, a part of an optical component such as a condenser lens may be directly fixed to the wall portion 313. As described above, the optical module 300 is configured as a single chip laser module including the single semiconductor laser element 20.

  As shown in FIG. 12, the wall portion 313 of the base portion 310 is formed with a convex portion 312 that protrudes from the surface 313 </ b> A of the wall portion 313 toward the lid portion 370. On the other hand, a concave portion 376 is formed on the lower surface 370 </ b> A of the lid portion 370 so as to receive the convex portion 312 corresponding to the convex portion 312. When the convex portion 312 is received in the concave portion 376, the lid portion 370 is placed on the surface 313 </ b> A of the wall portion 313.

  As shown in FIG. 12, a sealing resin 390 is provided in the gap between the convex portion 312 and the concave portion 376 so as to surround the convex portion 312. The sealing resin 390 seals the gap between the convex portion 312 and the concave portion 376. With such a configuration, the accommodation space S is sealed from the outside.

  According to such an optical module 300, since the convex part 312 is formed in the wall part 313 of the base part 310, even if the sealing resin 390 expand | swells, it is suppressed that a wall part 313 deform | transforms. Therefore, even when the optical fiber 51 (ferrule 52) and other optical components are directly fixed to the wall portion 313, the position of the optical fiber 51 is prevented from being shifted.

  In addition, when the convex part 312 is not the single convex part provided over the perimeter of the wall part 313, in order to improve the sealing effect of the storage space S, the bottom face 373 of the cover part 370 and the wall part 313 are used. It is preferable to provide a sealing resin 390 also between the surface 313A of the first and second surfaces 313A.

  In the present embodiment, the example in which the optical module 300 is configured as a single chip laser module has been described. However, it is needless to say that the present embodiment can be applied to other types of optical modules. Moreover, although the above-mentioned embodiment demonstrated the example which used the semiconductor laser element as the optical component which concerns on this invention, it is not restricted to this. For example, a photodiode may be used as the optical component according to the present invention, and an optical receiver module that receives light from the outside and converts it into electricity may be configured as the optical module according to the present invention.

  In the first to fourth embodiments described above, the case where the sealing resin expands has been described. Needless to say, the same effect can be obtained even when the sealing resin contracts.

  The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and it goes without saying that the present invention may be implemented in various forms within the scope of the technical idea.

  Note that the terms “lower”, “upper”, “left”, “right”, “bottom”, “front”, “upper”, “lower”, “upper”, “lower”, The terms “left side”, “right side” and other positional relationships are used in the context of the illustrated embodiment and vary depending on the relative positional relationship of the apparatus.

DESCRIPTION OF SYMBOLS 1 Optical module 10 Plate-shaped member 10A Surface 12 Convex part 16 Main-body part 20 Semiconductor laser element 30 1st collimating lens 32 2nd collimating lens 34 Light propagation direction change member 40 Cap member 41 1st part 42 2nd part 43 Ferrule insertion hole 51 Optical fiber 52 Ferrule 53 Ferrule fixing part 60 First condenser lens 62 Second condenser lens 70 Lid member 71 Upper wall 72A to 72D Side wall 73 Bottom face 74 Opening part 76 Concave part 80 Optical coupling means 90 Sealing Resin 100 Optical module 112 Convex part 176 Concave part 180 Optical coupling means 200 Optical module 210 Plate-like member 210A Surface 212 Convex part 216 Main body part 260 Lens 262 Lens 270 Lid member 271 Upper wall 272 Side wall 273 Bottom face 276 Concave part 279 Extension part 280 Light Coupling means 290 Resin 300 optical module 310 base 311 substrate 311A surface 312 convex portion 313 wall portion 313A surface 360 lens 362 lens 370 lid 370A underside 373 bottom 376 recess 380 optical coupling means 390 sealing resin

Claims (6)

The base,
An optical component fixed to the surface of the base,
A lid that forms a housing space containing the optical component together with the base;
With
The base portion has at least one convex portion that protrudes from the surface toward the lid portion outside the accommodation space;
The lid portion is provided with at least one concave portion formed to receive the at least one convex portion, corresponding to the at least one convex portion,
An optical module in which a sealing resin for sealing the accommodation space is formed between the base and the lid including a gap between the convex and the concave corresponding to each other. The optical component is
Optical fiber,
A semiconductor laser element capable of emitting laser light;
The optical module according to claim 1, further comprising optical coupling means for coupling the laser light to the optical fiber.   The optical module according to claim 1, wherein the at least one convex portion is a single convex portion provided around the surface of the base portion.   The optical module according to claim 1, wherein the at least one convex portion includes a plurality of convex portions provided to be separated from each other. The lid part includes at least one extension part extended toward the outside of the accommodation space,
The optical module according to claim 1, wherein the recessed portion is formed in the extended portion. The base is
A substrate on which the optical component is placed;
A wall portion extending from the substrate toward the lid portion,
The optical module according to claim 1, wherein the convex portion is provided on a surface of the wall portion of the surface of the base portion.

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