JP2016004880A - Housing structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a housing structure capable of reducing distortion caused by a temperature change when using a bottom plate and a frame body composed of materials having different thermal expansion coefficients, and easily fixing the bottom plate to the frame body while positioning the bottom plate at the frame body.SOLUTION: A laser module 100 as a housing structure includes a frame body 10 and a bottom plate 20 having different thermal expansion coefficients. The frame body 10 comprises a first side wall 11, a second side wall 12 facing the first side wall 11, a third side wall 13 extending between the first side wall 11 and the second side wall 12, a fourth side wall 14 facing the third side wall 13, and salients 81 to 84 protruding inwardly from the side walls 11 to 14. The bottom plate 20 comprises side surfaces 21 to 24 facing the inner surfaces of the side walls 11 to 14 of the frame body 10, and the facing surfaces facing the salients 81 to 84 of the frame body 10. The facing surfaces are perpendicular to the side surfaces 21 to 24.

Description

  The present invention relates to a housing structure, and more particularly to a housing structure composed of a frame body and a bottom plate having different thermal expansion coefficients.

  As an example of a housing structure composed of a frame body and a bottom plate having different thermal expansion coefficients, there is a laser module. As a structure of such a laser module, a structure in which a frame is attached to the upper surface of a bottom plate is known (for example, see Patent Document 1).

  In such a housing structure, since the thermal expansion coefficients of the bottom plate and the frame are different, when the housing structure is heated in a heat cycle test or the like, the difference between the thermal expansion coefficient of the bottom plate and the frame causes the bottom plate and the frame. There arises a problem that stress is generated in the joint portion of the metal plate and the bottom plate is deformed (warped). In particular, in the structure of Patent Document 1, since the bottom plate is larger than the region surrounded by the side wall of the frame body, there is a problem that distortion generated in the bottom plate is increased.

  Moreover, since the structure of patent document 1 is a structure which attaches a frame to the upper surface of a bottom plate, it is difficult to fix a bottom plate to a frame, positioning a bottom plate with respect to a frame, and the assembly of a housing structure is difficult. There's a problem.

JP 2013-183074 A

  The present invention has been made in view of such problems of the prior art, and reduces distortion caused by thermal expansion when a bottom plate and a frame made of materials having different thermal expansion coefficients are used. The first object is to provide a housing structure that can easily fix the bottom plate to the frame while positioning the bottom plate.

  Further, the present invention provides a housing structure including a bottom plate and a frame body made of materials having different thermal expansion coefficients, reduces distortion due to thermal expansion, and easily positions the bottom plate on the frame body while positioning the bottom plate with respect to the frame body. A second object of the present invention is to provide a method for manufacturing a housing structure that can be fixed to the housing.

  According to the first aspect of the present invention, when a bottom plate and a frame made of materials having different thermal expansion coefficients are used, distortion caused by thermal expansion is reduced, and the frame is positioned while positioning the bottom plate with respect to the frame. A housing structure that can easily fix the bottom plate is provided. The housing structure includes a frame body having a first thermal expansion coefficient and a bottom plate having a second thermal expansion coefficient different from the first thermal expansion coefficient. The frame includes a first side wall, a second side wall facing the first side wall, a third side wall extending between the first side wall and the second side wall, and the third side wall. And a fourth side wall facing the side wall. The first side wall has a first inner facing surface, the second side wall has a second inner facing surface, the third side wall has a third inner facing surface, The side wall of 4 has a fourth inner facing surface. Further, the frame body is perpendicular to at least one inner facing surface among the first inner facing surface, the second inner facing surface, the third inner facing surface, and the fourth inner facing surface. It has a locking surface. The bottom plate includes a first side surface facing the first inner facing surface of the frame body, a second side surface facing the second inner facing surface of the frame body, and a third inner side of the frame body. It has a third side surface facing the facing surface, a fourth side surface facing the fourth inner facing surface of the frame body, and a contact surface in contact with the locking surface of the frame body. The first linear expansion coefficient may be larger than the second linear expansion coefficient.

  According to such a configuration, the bottom plate can be made smaller than the region sandwiched between the first side wall, the second side wall, the third side wall, and the fourth side wall of the frame, and accordingly, accompanying the temperature change The amount of thermal expansion of the bottom plate can be reduced, and deformation of the bottom plate can be suppressed. Further, by inserting the bottom plate into the housing portion defined by the first inner facing surface, the second inner facing surface, the third inner facing surface, the fourth inner facing surface, and the locking surface of the frame. The bottom plate can be fixed to the frame while the bottom plate is positioned with respect to the frame. Therefore, the assembly of the housing structure becomes extremely easy.

  It is preferable that the 1st side surface of the said baseplate is in contact with the 1st inner side opposing surface of the said frame. As described above, if the first side surface of the bottom plate is in contact with the first inner facing surface of the frame body, the bottom plate can be accurately positioned in at least one direction on the basis of the first inner facing surface of the frame body. it can.

  Further, it is preferable that a first gap is formed between the second side surface of the bottom plate and the second inner facing surface of the frame body. By forming such a first gap, even if the bottom plate extends due to thermal expansion, the influence can be mitigated by the first gap. In this case, the locking surface may extend inward from at least one of the first inner facing surface and the second inner facing surface. At this time, it is preferable that the entire length of the locking surface extending inward from at least one of the first inner facing surface and the second inner facing surface is longer than the first gap. By making the entire length of the locking surface longer than the first gap, the bottom plate can be easily engaged with the locking surface when the bottom plate is attached to the frame, so that the bottom plate can be easily attached to the frame. be able to.

  It is preferable that the 3rd side surface of the said baseplate is in contact with the 3rd inner side opposing surface of the said frame. Thus, if the third side surface of the bottom plate is in contact with the third inner facing surface of the frame body, the bottom plate can be accurately positioned in at least one direction with reference to the third inner facing surface of the frame body. it can.

  Moreover, it is preferable that the 2nd clearance gap is formed between the 4th side surface of the said baseplate, and the 4th inner side opposing surface of the said frame. By forming such a second gap, even if the bottom plate extends due to thermal expansion, the influence can be mitigated by the second gap. In this case, the locking surface may extend inward from at least one of the third inner facing surface and the fourth inner facing surface. At this time, it is preferable that the entire length of the locking surface extending inward from at least one of the third inner facing surface and the fourth inner facing surface is longer than the second gap. By making the entire length of the locking surface longer than the second gap, the bottom plate can easily engage with the locking surface when the bottom plate is attached to the frame, thereby facilitating the attachment of the bottom plate to the frame. be able to.

  Moreover, it is preferable to make the said baseplate protrude below from the lower end of the said frame. According to such a configuration, when the housing structure is attached to a heat sink or the like, the entire bottom surface of the bottom plate comes into contact with the heat sink, so that the bottom plate is reliably brought into contact with the heat sink to effectively cool the housing structure. be able to.

  According to the second aspect of the present invention, in a housing structure including a bottom plate and a frame body made of materials having different thermal expansion coefficients, distortion due to thermal expansion is reduced, and the frame is positioned while positioning the bottom plate with respect to the frame body. Provided is a method of manufacturing a housing structure that can easily fix a bottom plate to a body. In this method, a frame body having a first thermal expansion coefficient and a bottom plate having a second thermal expansion coefficient different from the first thermal expansion coefficient are prepared. The frame includes a first side wall, a second side wall facing the first side wall, a third side wall extending between the first side wall and the second side wall, and the third side wall. And a fourth side wall facing the side wall. The first side wall has a first inner facing surface, the second side wall has a second inner facing surface, the third side wall has a third inner facing surface, The side wall of 4 has a fourth inner facing surface. Further, the frame body is perpendicular to at least one inner facing surface among the first inner facing surface, the second inner facing surface, the third inner facing surface, and the fourth inner facing surface. It has a locking surface. The bottom plate is smaller in size than a region defined by the first side wall, the second side wall, the third side wall, and the fourth side wall of the frame. The first side surface, the second side surface, the third side surface, and the fourth side surface of the bottom plate are respectively the first inner facing surface, the second inner facing surface, and the second side surface of the frame. 3, the first inner facing surface, the second inner facing surface, the third inner facing surface, and the second inner facing surface of the frame so as to face the third inner facing surface and the fourth inner facing surface. The bottom plate is inserted into the accommodating portion defined by the inner facing surface of 4 and the locking surface, and the bottom plate is fixed to the frame. The first linear expansion coefficient may be larger than the second linear expansion coefficient.

  When the frame and the bottom plate are fixed, the frame and the bottom plate may be fixed so that the first side surface of the bottom plate is in contact with the first inner facing surface of the frame. When the frame and the bottom plate are fixed, the frame and the bottom plate are formed such that a first gap is formed between the second side surface of the bottom plate and the second inner facing surface of the frame. And may be fixed. Further, the locking surface may be formed longer than the first gap inward from at least one of the first inner facing surface and the second inner facing surface.

  When the frame and the bottom plate are fixed, the frame and the bottom plate may be fixed such that the third side surface of the bottom plate is in contact with the third inner facing surface of the frame. When the frame and the bottom plate are fixed, the frame and the bottom plate are formed such that a second gap is formed between the fourth side surface of the bottom plate and the fourth inner facing surface of the frame. And may be fixed. Further, the locking surface may be formed longer than the second gap inward from at least one of the third inner facing surface and the fourth inner facing surface. Furthermore, it is preferable that the bottom plate protrudes downward from the lower end of the frame.

  According to the present invention, since the bottom plate can be made smaller than the region sandwiched between the first side wall, the second side wall, the third side wall, and the fourth side wall of the frame, The amount of thermal expansion can be reduced, and deformation of the bottom plate can be suppressed. Further, the bottom plate is inserted into the housing portion defined by the first inner facing surface, the second inner facing surface, the third inner facing surface, the fourth inner facing surface, and the locking surface of the frame. Can be fixed to the frame, so that the assembly of the housing structure becomes extremely easy.

It is a top view which shows typically the laser module in the 1st Embodiment of this invention. FIG. 2 is a bottom view schematically showing the laser module in FIG. 1. It is the III-III sectional view taken on the line of FIG. It is the IV-IV sectional view taken on the line of FIG. It is sectional drawing at the time of arrange | positioning a baseplate by the method different from the 1st Embodiment of this invention. It is sectional drawing which shows typically the method to manufacture the laser module in the 1st Embodiment of this invention. It is sectional drawing which shows typically the method to manufacture the laser module in the 1st Embodiment of this invention. It is sectional drawing which shows typically the method to manufacture the laser module in the 1st Embodiment of this invention. It is sectional drawing which shows typically the laser module in the 2nd Embodiment of this invention. It is sectional drawing which shows typically the laser module in the 3rd Embodiment of this invention.

  Hereinafter, embodiments of a housing structure according to the present invention will be described in detail with reference to FIGS. 1 to 9. In FIG. 1 to FIG. 9, the same or corresponding components are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a plan view schematically showing a laser module 100 according to the first embodiment of the present invention, and FIG. 2 is a bottom view. As shown in FIGS. 1 and 2, the laser module 100 includes a frame 10 having four side walls, a flat bottom plate 20, a submount 30 mounted on the bottom plate 20, and a submount 30. A laser mount 40 placed, a semiconductor laser diode 50 placed on the laser mount 40, and a fiber mount 60 placed on the submount 30 are provided. Here, the frame body 10 and the bottom plate 20 are formed of materials having different linear expansion coefficients, and the linear expansion coefficient of the frame body 10 is larger than the linear expansion coefficient of the bottom plate 20.

  A fiber hole (not shown) for inserting an optical fiber 70 extending in the X direction is formed in the frame body 10, and an end of the optical fiber 70 inserted through the fiber hole is soldered on the fiber mount 60, for example. 62 is fixed. At this time, the optical fiber 70 is arranged so that the laser light emitted from the semiconductor laser diode 50 is coupled to the tip portion 70A of the optical fiber 70, and the laser light emitted from the semiconductor laser diode 50 is The light enters the front end portion 70A and propagates through the optical fiber 70.

  As shown in FIG. 1, the frame 10 includes a first side wall 11 extending along the Y direction, a second side wall 12 extending along the Y direction so as to face the first side wall 11, and a first side wall 11. A third side wall 13 extending along the X direction between the side wall 11 and the second side wall 12 and a fourth side wall 14 extending along the X direction opposite to the third side wall 13 are included. . As shown in FIG. 2, the first side wall 11 has an inner facing surface 11 </ b> A that faces a space surrounded by the four side walls 11 to 14. Similarly, the second side wall 12 has an inner facing surface 12A, the third side wall 13 has an inner facing surface 13A, and the fourth side wall 14 has an inner facing surface 14A. The bottom plate 20 includes a first side surface 21 that faces the inner facing surface 11 </ b> A of the first side wall 11, a second side surface 22 that faces the inner facing surface 12 </ b> A of the second side wall 12, and the third side wall 13. A third side surface 23 facing the inner facing surface 13A and a fourth side surface 24 facing the inner facing surface 14A of the fourth side wall 14 are included.

  As shown in FIG. 2, among the four side surfaces of the bottom plate 20, the first side surface 21 and the third side surface 23 are the inner facing surface 11 </ b> A of the first side wall 11 of the frame 10 and the inner side of the third side wall 13, respectively. It is in contact with the facing surface 13A. The second side surface 22 and the fourth side surface 24 of the bottom plate 20 are not in contact with the frame body 10, and are between the second side surface 22 of the bottom plate 20 and the inner facing surface 12 </ b> A of the second side wall 12 of the frame body 10. A gap 15 is formed between the fourth side surface 24 of the bottom plate 20 and the inner facing surface 14 </ b> A of the fourth side wall 14 of the frame body 10.

  3 is a cross-sectional view taken along line III-III in FIG. 1, and FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. As shown in FIG. 3, the first side wall 11 and the second side wall 12 of the frame body 10 are respectively formed with convex portions 81 and 82 that project inside the frame body 10. The lower surface 81A of the convex portion 81 extends perpendicularly from the inner facing surface 11A of the first side wall 11 toward the inside of the frame body 10, and is engaged with the peripheral edge portion 25 (contact surface) of the upper surface of the bottom plate 20. Configure the surface. Similarly, the lower surface 82 </ b> A of the convex portion 82 extends vertically from the inner facing surface 12 </ b> A of the second side wall 12 toward the inside of the frame body 10, and the peripheral edge 25 (contact surface) on the upper surface of the bottom plate 20. A contact surface is formed. Further, as shown in FIG. 4, the third side wall 13 and the fourth side wall 14 of the frame body 10 are also formed with protrusions 83 and 84 that protrude inward of the frame body 10. The lower surface 83A of the convex portion 83 extends perpendicularly from the inner facing surface 13A of the third side wall 13 toward the inside of the frame body 10, and is engaged with the peripheral edge portion 25 (contact surface) of the upper surface of the bottom plate 20. Configure the surface. Similarly, the lower surface 84 </ b> A of the convex portion 84 extends perpendicularly from the inner facing surface 14 </ b> A of the fourth side wall 14 toward the inner side of the frame body 10, and the peripheral edge 25 (contact surface) of the upper surface of the bottom plate 20. A contact surface is formed.

  Here, the lengths of the protrusions 81 and 82 extending in the X direction are preferably larger than the width of the gap 15 in the X direction, and the lengths of the protrusions 83 and 84 extending in the Y direction are the lengths of the gap 16. It is preferably larger than the width in the Y direction. Since the bottom plate 20 is easily engaged with the convex portions 81 to 84 when the bottom plate 20 is attached to the frame body 10 by using the convex portions 81 to 84 having such a length, the bottom plate 20 is attached to the frame body 10. Mounting can be facilitated.

  As described above, the bottom plate 20 in the present embodiment is disposed inside the side walls 11 to 14 of the frame body 10 and is formed smaller than a region surrounded by the side walls 11 to 14. Therefore, compared with the case where the same frame 10 is used for the laser module described in Patent Document 1, the amount of thermal expansion of the bottom plate 20 due to temperature change can be reduced, and deformation of the bottom plate 20 can be suppressed. Further, between the second side surface 22 of the bottom plate 20 and the inner facing surface 12A of the second side wall 12 of the frame body 10, and the inner side facing of the fourth side surface 24 of the bottom plate 20 and the fourth side wall 14 of the frame body 10. Since the gaps 15 and 16 are formed between the surface 14A, even if the bottom plate 20 extends due to thermal expansion, the influence can be mitigated by the gaps 15 and 16.

  On the other hand, since the first side surface 21 of the bottom plate 20 is in contact with the inner facing surface 11A of the first side wall 11 of the frame body 10, the X direction is set with reference to the inner facing surface 11A of the first side wall 11 of the frame body 10. It is possible to position the bottom plate 20 accurately. Similarly, since the third side surface 23 of the bottom plate 20 is in contact with the inner facing surface 13A of the third side wall 13 of the frame body 10, the inner facing surface 13A of the third side wall 13 of the frame body 10 is used as a reference. It is possible to accurately position the bottom plate 20 in the direction. In other words, the bottom plate 20 can be accurately positioned in the XY direction with reference to the point P (see FIG. 2) where the first side wall 11 and the third side wall 13 of the frame 10 intersect.

  Furthermore, in this embodiment, since the contact surface 25 at the peripheral edge of the upper surface of the bottom plate 20 comes into contact with the locking surface 18 that is the lower surface of the convex portions 81 to 84 of the frame body 10, the frame body 10. The bottom plate 20 can be accurately positioned in the Z direction with reference to the lower surfaces of the convex portions 81 to 84.

  Here, it is conceivable that tensile stress is generated in the optical fiber 70 fixed to the frame 10 and the bottom plate 20 due to thermal expansion of the frame 10 and the bottom plate 20 due to temperature change. In the present embodiment, as shown in FIG. 3, the side surface (first side surface 21) of the bottom plate 20 is in contact with the inner surface (inner facing surface 11 </ b> A) of the side wall of the frame 10 to which the optical fiber 70 is fixed. Therefore, the tensile stress generated in the optical fiber 70 can be reduced. That is, as shown in FIG. 3, the first side surface 21 of the bottom plate 20 is in contact with the inner facing surface 11 </ b> A of the first side wall 11 of the frame body 10, but the second side surface 22 of the bottom plate 20 and the frame body 10. A gap 15 is formed between the second side wall 12 and the inner facing surface 12A. With such a configuration, the tensile stress of the optical fiber 70 accompanying the temperature change of the laser module 100 is reduced. Hereinafter, this point will be described.

When the thermal expansion coefficient of the bottom plate 20 at a certain temperature is α, the thermal expansion coefficient of the frame body 10 is β, and the temperature change is ΔT, the center of the first side wall 11 of the frame body 10 shown in FIG. The amount of change ΔL of the length L of the optical fiber 70 up to the solder 62 is obtained by the following equation (1).
ΔL = (L _A1 α + L _B β) ΔT (1)

Here, as shown in FIG. 5, the first side surface 21 of the bottom plate 20 is not in contact with the inner facing surface 11 </ b> A of the first side wall 11 of the frame body 10, and the second side surface 22 of the bottom plate 20 is the frame body 10. Consider a case where the second side wall 12 contacts the inner facing surface 12A. At this time, a change amount ΔL ′ of the length L of the optical fiber 70 from the center in the X direction of the first side wall 11 of the frame body 10 to the solder 62 on the fiber mount 60 is obtained by the following equation (2).
ΔL ′ = ((L _B + L _A1 + L _A2 + d) β− (L _A2 + d) α) ΔT
= ((L _B + L _A1 ) β + (L _A2 + d) (β−α)) ΔT (2)

Here, since the thermal expansion coefficient β of the frame 10 is larger than the thermal expansion coefficient α of the bottom plate 20 (β> α), the following formula (3) is derived from the formula (1).
ΔL = (L _A1 α + L _B β) ΔT <(L _A1 + L _B ) βΔT (3)
Further, the following equation (4) is derived from the equation (2).
ΔL ′ = ((L _B + L _A1 ) β + (L _A2 + d) (β−α)) ΔT> (L _A1 + L _B ) βΔT
... (4)
From these equations (3) and (4), the following equation (5) is established.
ΔL <(L _A1 + L _B ) βΔT <ΔL ′ (5)

  In this way, ΔL <ΔL ′ and the second side surface 22 of the bottom plate 20 is when the first side surface 21 of the bottom plate 20 is in contact with the inner facing surface 11A of the first side wall 11 of the frame body 10. It can be seen that the amount of change ΔL of the length L of the optical fiber 70 can be made smaller than when contacting the inner facing surface 12A of the second side wall 12 of the frame 10. That is, the first side surface 21 of the bottom plate 20 is in contact with the inner facing surface 11A of the first side wall 11 of the frame body 10, and the second side surface 22 of the bottom plate 20 and the inner side surface of the second side wall 12 of the frame body 10 are opposed to each other. When the gap 15 is formed with the surface 12A, it is possible to reduce the tensile stress generated in the optical fiber 70 due to the thermal expansion of the frame 10 and the bottom plate 20 due to the temperature change. Therefore, it is possible to prevent the optical fiber 70 from being broken due to thermal expansion accompanying temperature change.

  The bottom plate 20 is fixed to the frame 10 with an adhesive or solder, but these adhesive and solder are not shown. Since the adhesive can absorb the deformation of the bottom plate 20 and the frame body 10 due to temperature changes to some extent, it is preferable to fix the bottom plate 20 to the frame body 10 using an adhesive material. For example, between the first side surface 21 of the bottom plate 20 and the inner facing surface 11 </ b> A of the first side wall 11 of the frame body 10, the inner side facing of the third side surface 23 of the bottom plate 20 and the third side wall 13 of the frame body 10. Between the surface 13A, between the second side surface 22 of the bottom plate 20 and the inner facing surface 12A of the second side wall 12 of the frame 10, and between the fourth side surface 24 of the bottom plate 20 and the fourth side wall of the frame 10. 14 between the inner facing surface 14A and the peripheral portion 25 on the upper surface of the bottom plate 20 and the lower surfaces 81A, 82A, 83A, and 84A of the convex portions 81 to 84 of the frame body 10. It is preferable to make it. In particular, as shown in FIG. 2, it is preferable to interpose an adhesive at a point P where the first side wall 11 and the third side wall 13 of the frame 10 intersect. Thus, in this specification, “contact” or “contact” includes not only the case where members directly contact each other but also the case where an adhesive is interposed between the members.

  In the present embodiment, as shown in FIG. 3, the bottom plate 20 protrudes downward from the lower end of the frame body 10. Accordingly, when the laser module 100 is attached to a heat sink (not shown) or the like, the entire lower surface of the bottom plate 20 comes into contact with the heat sink, so that the bottom plate 20 is reliably brought into contact with the heat sink to effectively cool the laser module 100. It can be carried out.

  Next, a method for manufacturing the laser module of this embodiment will be described with reference to FIGS. When manufacturing the laser module of this embodiment, first, the submount 30, the laser mount 40, the semiconductor laser diode 50, and the fiber mount 60 are fixed and mounted on the bottom plate 20 (FIG. 6).

  Then, the frame body 10 is turned upside down and an adhesive (see FIG. 8) is attached to at least a part of the lower surfaces 81A, 82A, 83A, 84A of the convex portions 81-84 or the inner facing surfaces 11A, 12A, 13A, 14A of the frame body 10 in the vicinity. (Not shown) is applied (FIG. 7). By using a UV curable resin that does not need to be heated as the adhesive at this time, the occurrence of thermal expansion may be prevented.

  Thereafter, the bottom plate 20 on which the mounting member such as the semiconductor laser diode 50 is mounted is turned over, and the bottom plate 20 is inserted into the accommodating portion 17 defined by the side walls 11 to 14 and the convex portions 81 to 84 of the frame body 10, The bottom plate 20 is placed on the convex portions 81 to 84 (FIG. 8). At this time, the first side surface 21 of the bottom plate 20 is in contact with the inner facing surface 11A of the first side wall 11 of the frame body 10, and the third side surface 23 of the bottom plate 20 is the third side wall 13 of the frame body 10. The bottom plate 20 is inserted so as to contact the inner facing surface 13A. Accordingly, the bottom plate 20 can be fixed to the frame body 10 in a state where the bottom plate 20 is accurately positioned in the two directions XY. Further, since the contact surface 25 (the lower surface in FIG. 8) of the bottom plate 20 is locked to the locking surfaces 81A, 82A, 83A, 84A (the upper surface in FIG. 8) of the convex portions 81 to 84 of the frame body 10, The bottom plate 20 can be fixed to the frame body 10 in a state where the bottom plate 20 is also accurately positioned in the Z direction.

  Finally, the optical fiber 70 is inserted into the fiber hole formed in the side wall 11 of the frame 10 and the optical fiber 70 is positioned at an appropriate position. Fix it. Thereby, the laser module 100 as shown in FIG. 3 is completed.

  As described above, according to the present embodiment, the inner facing surfaces 11A, 12A, 13A, and 14A of the side walls 11 to 14 of the frame 10 and the locking surfaces 81A, 82A, 83A, and 84A of the convex portions 81 to 84 are defined. By inserting the bottom plate 20 into the accommodating portion 17, the bottom plate 20 can be fixed to the frame body 10 with the bottom plate 20 positioned relative to the frame body 10. Therefore, the assembly of the laser module 100 becomes extremely easy.

  FIG. 9 is a cross-sectional view schematically showing a laser module according to the second embodiment of the present invention. As shown in FIG. 9, in the present embodiment, the bottom plate 20 is disposed above the convex portions 81 to 84 (the convex portions 83 and 84 are not shown) of the frame body 10. Other configurations are the same as those in the first embodiment described above. In the present embodiment, the peripheral edge portion of the bottom surface of the bottom plate 20 constitutes a contact surface 125 that faces the convex portions 81 to 84, and this contact surface 125 is the upper surface 81B, 82B, 83B, 84B of the convex portions 81 to 84. (The upper surfaces 83B and 84B are not shown). Therefore, in this embodiment, the upper surfaces 81B, 82B, 83B, and 84B of the convex portions 81 to 84 constitute a locking surface.

  FIG. 10 is a cross-sectional view schematically showing a laser module according to the third embodiment of the present invention. In embodiment mentioned above, although the baseplate 20 was attached using the convex parts 81-84 formed in the frame 10, as shown in FIG. 10, the side walls 11-11 of a frame are not provided without providing the convex parts 81-84. 14, inner facing surfaces 11 </ b> A, 12 </ b> A, 13 </ b> A, 14 </ b> A (only the inner facing surfaces 11 </ b> A, 12 </ b> A are shown in FIG. 10) and locking surfaces 11 </ b> B, 12 </ b> B, 13 </ b> B, 14 </ b> B ( In FIG. 10, only the locking surfaces 11B and 12B are shown).

  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. For example, in the above-described embodiment, the convex portions 81 to 84 projecting inward from the respective side walls 11 to 14 of the frame body 10 are formed, but such convex portions are formed on all the side walls 11 of the frame body 10. It is not necessary to form in -14, What is necessary is just to form a convex part in at least 1 of the side walls 11-14.

  It should be noted that the terms “upper surface”, “lower surface”, “bottom surface”, “lower”, “upper” and other positional relationships used in this specification are used in the context of the illustrated embodiment. Therefore, it can be understood that it changes depending on the relative positional relationship of the components in the laser module 100.

  Further, in the above-described embodiment, the laser module has been described as an example of the housing structure. However, the present invention is not limited to the laser module as long as it includes a frame body and a bottom plate having different thermal expansion coefficients. It can be applied to a housing structure.

DESCRIPTION OF SYMBOLS 10 Frame 11 1st side wall 11A Inner facing surface 12 2nd side wall 12A Inner facing surface 13 3rd side wall 13A Inner facing surface 14 4th side wall 14A Inner facing surface 15, 16 Gap 17 Storage part 20 Bottom plate 21 First 1 side surface 22 second side surface 23 third side surface 24 fourth side surface 25 contact surface 30 submount 40 laser mount 50 semiconductor laser diode 60 fiber mount 62 solder 70 optical fiber 81 convex portion 81A locking surface 82 convex portion 82A Locking surface 83 Projection 83A Locking surface 84 Projection 84A Locking surface 100 Laser module 125 Contact surface 210 Notch

Claims (18)

A housing structure having a frame having a first thermal expansion coefficient and a bottom plate having a second thermal expansion coefficient different from the first thermal expansion coefficient,
The frame is
A first sidewall having a first inner facing surface;
A second side wall facing the first side wall, the second side wall having a second inner facing surface;
A third sidewall extending between the first sidewall and the second sidewall, the third sidewall having a third inner facing surface;
A fourth side wall facing the third side wall, the fourth side wall having a fourth inner facing surface;
A locking surface perpendicular to at least one inner facing surface among the first inner facing surface, the second inner facing surface, the third inner facing surface, and the fourth inner facing surface;
Have
The bottom plate is
A first side surface facing the first inner facing surface of the frame,
A second side surface facing the second inner facing surface of the frame,
A third side surface facing the third inner facing surface of the frame,
A fourth side surface facing the fourth inner facing surface of the frame,
A contact surface in contact with the locking surface of the frame,
A housing structure characterized by comprising:   The housing structure according to claim 1, wherein a first side surface of the bottom plate is in contact with a first inner facing surface of the frame body.   The housing structure according to claim 1, wherein a first gap is formed between a second side surface of the bottom plate and a second inner facing surface of the frame body. The locking surface extends inward from at least one of the first inner facing surface and the second inner facing surface,
4. The length of the locking surface extending inward from at least one of the first inner facing surface and the second inner facing surface is longer than the first gap. 5. Enclosure structure.   5. The housing structure according to claim 1, wherein a third side surface of the bottom plate is in contact with a third inner facing surface of the frame body.   6. The housing according to claim 1, wherein a second gap is formed between a fourth side surface of the bottom plate and a fourth inner facing surface of the frame body. Body structure. The locking surface extends inward from at least one of the third inner facing surface and the fourth inner facing surface,
The length of the locking surface extending inward from at least one of the third inner facing surface and the fourth inner facing surface is longer than the second gap. Enclosure structure.   The casing structure according to claim 1, wherein the bottom plate protrudes downward from a lower end of the frame.   The housing structure according to any one of claims 1 to 8, wherein the first linear expansion coefficient is larger than the second linear expansion coefficient. A frame having a first thermal expansion coefficient, a first side wall having a first inner facing surface, and a second side wall facing the first side wall, the second inner facing surface A third sidewall extending between the first sidewall and the second sidewall, the third sidewall having a third inner facing surface, and the third sidewall. A fourth side wall facing the side wall, the fourth side wall having a fourth inner facing surface, the first inner facing surface, the second inner facing surface, the third inner facing surface, And a frame having a locking surface perpendicular to at least one inner facing surface of the fourth inner facing surfaces,
A bottom plate having a second coefficient of thermal expansion different from the first coefficient of thermal expansion, wherein the first side wall, the second side wall, the third side wall, and the fourth side of the frame body Prepare a bottom plate that is smaller than the area defined by the side walls,
The first side surface, the second side surface, the third side surface, and the fourth side surface of the bottom plate are respectively the first inner facing surface, the second inner facing surface of the frame, The first inner facing surface, the second inner facing surface, the third inner facing surface, and the third inner facing surface of the frame so as to face the third inner facing surface and the fourth inner facing surface, A method for manufacturing a housing structure, wherein the bottom plate is inserted into a receiving portion defined by a fourth inner facing surface and the locking surface, and the bottom plate is fixed to the frame body.   When the frame and the bottom plate are fixed, the frame and the bottom plate are fixed so that a first side surface of the bottom plate is in contact with a first inner facing surface of the frame. The manufacturing method of the housing structure according to claim 10.   When fixing the frame and the bottom plate, the frame and the frame so that a first gap is formed between the second side surface of the bottom plate and the second inner facing surface of the frame. The method for manufacturing a housing structure according to claim 10 or 11, wherein the bottom plate is fixed.   13. The locking surface according to claim 12, wherein the locking surface is formed to be longer than at least one of the first gap toward the inside from at least one of the first inner facing surface and the second inner facing surface. Manufacturing method of housing structure.   When the frame and the bottom plate are fixed, the frame and the bottom plate are fixed such that a third side surface of the bottom plate is in contact with a third inner facing surface of the frame. A method for manufacturing a housing structure according to any one of claims 10 to 13.   When the frame and the bottom plate are fixed, the frame and the bottom plate are formed such that a second gap is formed between the fourth side surface of the bottom plate and the fourth inner facing surface of the frame. The method for manufacturing a housing structure according to any one of claims 10 to 14, wherein the bottom plate is fixed.   16. The housing according to claim 15, wherein the locking surface is formed longer than the second gap inward from at least one of the third inner facing surface and the fourth inner facing surface. Body structure manufacturing method.   The method for manufacturing a housing structure according to any one of claims 10 to 16, wherein the bottom plate protrudes downward from a lower end of the frame.   The method for manufacturing a housing structure according to any one of claims 10 to 17, wherein the first linear expansion coefficient is larger than the second linear expansion coefficient.

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