JP6490784B2 - Optical device - Google Patents

Description

  The present invention relates to an optical device including an optical module and its control circuit.

  In recent years, there has been a demand for further miniaturization in an optical device including an optical module and its control circuit, such as an tunable laser assembly (ITLA) (Non-patent Document 1).

JP 2013-118315 A

Atsushi Yamamoto, Takeo Okanaba, Yoshitaka Yazaki, Masayoshi Nishida, “Development of a compact ITLA for optical digital coherent communication”, Furukawa Electric Times, No. 134, (January 2015), pages 2-6

  As communication traffic has increased in recent years, communication devices have been mounted with high density in order to increase communication capacity. Therefore, downsizing of optical devices is required. In order to realize miniaturization, it is desirable to reduce the size of the printed circuit board on which the control circuit in the optical device is mounted, but it is necessary to reduce the size while maintaining the conventional function or adding a new function.

  The present invention has been made in view of the above, and an object thereof is to provide an optical device in which a mounting area of a printed board on which a control circuit is mounted is widened.

  In order to solve the above-described problems and achieve the object, an optical device according to an aspect of the present invention includes an optical module including an electrical pin, and a control for controlling the optical module by connecting the electrical pin of the optical module. A printed circuit board on which a circuit is mounted and an opening is formed, a first plate member to which the printed circuit board is attached, and an opening of the printed circuit board, and the printed circuit board and the first plate member are fixed. A first fixing member, a second plate-like member disposed on the opposite side of the first plate-like member across the printed circuit board, and the optical module including the first plate-like member and the second plate-like member. And a second fixing member for fixing the first fixing member and the second plate-like member so as to be sandwiched by each other.

  In the optical device according to one aspect of the present invention, the printed circuit board is provided with a connector pin, and both the second fixing member and the connector pin are opposed to the printed circuit board of the second plate-shaped member. It is characterized in that it does not protrude from the surface opposite to the surface to be turned on.

  In the optical device according to an aspect of the present invention, the first fixing member has a head portion and a fixing portion, and the fixing portion of the first fixing member is fixed to the first plate member, The printed circuit board and the first plate-shaped member are fixed by the plate-shaped member and the head of the first fixed member coming into contact with the printed circuit board, and the second fixed member includes the head and the fixed portion. The fixing portion of the second fixing member is fixed to the head of the first fixing member, and the head of the first fixing member and the head of the second fixing member are in the second plate shape. The first fixing member and the second plate-like member are fixed by contacting the member.

  The optical device according to an aspect of the present invention is characterized in that the head of the first fixing member is in contact with the printed circuit board with a length of ½ or more of the length in the outer peripheral direction.

  The optical device according to an aspect of the present invention is characterized in that, in the first fixing member or the second fixing member, the fixing portion is a screw portion in which a screw is formed.

  The optical device according to an aspect of the present invention is characterized in that, in the first fixing member and the second fixing member, the fixing portion is a screw portion in which a screw is formed.

  In the optical device according to an aspect of the present invention, the screw portion of the first fixing member is a male screw, a screw hole is formed in the head of the first fixing member, and the screw portion of the second fixing member. Is a male screw screwed into the screw hole in the head of the first fixing member.

  The optical device according to an aspect of the present invention is characterized in that the first fixing member and the second fixing member are formed with a through-hole penetrating along a central axis.

  In the optical device according to an aspect of the present invention, the first fixing member includes a first fixing portion and a second fixing portion, and the first fixing portion is inserted through an opening of the printed circuit board, and the print The substrate and the first plate member are fixed, and the second fixing member is fixed to the second fixing portion of the first fixing member, so that the optical module is connected to the first plate member and the first plate member. The first fixing member and the second plate member are fixed so as to be sandwiched between the second plate members.

  In the optical device according to an aspect of the present invention, the first fixing member has a large-diameter portion positioned between the first fixing portion and the second fixing portion, and the first fixing portion is the first fixing portion. The printed board and the first plate-like member are fixed by the first plate-like member being fixed and the first plate-like member and the large-diameter portion abutting against the printed board, and the second fixing member. Is fixed to the second fixing portion of the first fixing member, and the second fixing member and the large-diameter portion abut against the second plate-like member, whereby the first fixing member and the second plate The fixed member is fixed.

  The optical device according to an aspect of the present invention is characterized in that the large-diameter portion of the first fixing member is in contact with the printed circuit board with a length of ½ or more in the outer peripheral direction.

  In the optical device according to an aspect of the present invention, in the first fixing member, the first fixing portion and the second fixing portion are screw portions formed with screws, and the second fixing member is a nut member. It is characterized by that.

  The optical device according to an aspect of the present invention is characterized in that the first fixing member is formed with a through-hole penetrating along the central axis.

  In the optical device according to one aspect of the present invention, a radiator is interposed between at least one of the optical module and the first plate member and between the optical module and the second plate member. It is characterized by that.

  The optical device according to an aspect of the present invention is characterized in that the heat radiator is a heat radiating pad, a heat radiating sheet, or a heat radiating grease.

  In the optical device according to one aspect of the present invention, an elastic member is interposed between at least one of the optical module and the first plate member and between the optical module and the second plate member. It is characterized by that.

  The optical device according to one aspect of the present invention is characterized in that the optical module includes a semiconductor laser.

  In the optical device according to one aspect of the present invention, the optical module includes a wavelength tunable laser.

  According to the present invention, there is an effect that the mounting area of the printed circuit board on which the control circuit is mounted can be increased.

FIG. 1 is a schematic perspective view illustrating the configuration of the optical device according to the first embodiment. FIG. 2 is a diagram illustrating a state in which the second screw member and the second plate member are removed from the optical device illustrated in FIG. 1. FIG. 3 is a diagram illustrating a state in which the first screw member and the optical module are further removed from the state of FIG. 2. 4 is a view taken in the direction of arrow A in FIG. FIG. 5A is a schematic diagram of the first screw member. FIG. 5B is a schematic diagram of the second screw member. FIG. 6 is a diagram for explaining a method of assembling the optical device shown in FIG. FIG. 7 is a diagram for explaining a method of assembling the optical device shown in FIG. FIG. 8 is a diagram illustrating the relationship between the opening of the printed circuit board and the head of the first screw member. FIG. 9 is a diagram for explaining the height relationship. FIG. 10A is a schematic perspective view illustrating a configuration of an optical device according to a modification of the first embodiment. FIG. 10B is a partially enlarged view of FIG. 10A. FIG. 11 is a schematic perspective view illustrating the configuration of the optical device according to the second embodiment. 12 is a partial cross-sectional view taken along line BB in FIG. FIG. 13 is a schematic diagram of a screw member. FIG. 14 is a schematic perspective view illustrating the configuration of the optical device according to the third embodiment. FIG. 15 is a schematic cross-sectional view illustrating Modification 1 of the first fixing member and the second fixing member. FIG. 16 is a schematic cross-sectional view illustrating Modification 2 of the first fixing member and the second fixing member.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, this invention is not limited by this embodiment. In the description of the drawings, the same or corresponding elements are denoted by the same reference numerals as appropriate. It should be noted that the drawings are schematic, and the relationship between the dimensions of each element, the ratio of each element, and the like may differ from the actual situation. Even between the drawings, there are cases in which portions having different dimensional relationships and ratios are included.

  The present inventors diligently studied to increase the mounting area of the printed circuit board on which the control circuit is mounted. In the conventional optical device, attention is paid to the fact that the optical module and the printed circuit board on which the control circuit for controlling the optical module is individually fixed to the plate-like member with screws. Therefore, the present inventors have a structure that reduces the number of fixing points with screws, thereby reducing the area of the printed circuit board where electronic components cannot be placed or patterned due to the presence of the fixing structure. Since the structure could reduce the area where the printed board could not be arranged, it was conceived that the mounting area of the printed board could be increased.

(Embodiment 1)
FIG. 1 is a schematic perspective view illustrating the configuration of the optical device according to the first embodiment. As illustrated in FIG. 1, the optical device 100 includes an optical module 10, a printed circuit board 20, a first plate-like member 30, four first screw members 40 that are one aspect of the first fixing member, and a second one. The plate-shaped member 50 and at least four second screw members 60 that are one mode of the second fixing member are provided.

  FIG. 2 is a diagram illustrating a state in which the second screw member 60 and the second plate member 50 are removed from the optical device 100. FIG. 3 is a diagram illustrating a state in which the first screw member 40 and the optical module 10 are further removed from the state of FIG. 4 is a view taken in the direction of arrow A in FIG. 5A and 5B are schematic views of the first screw member 40 and the second screw member 60, respectively. Hereinafter, the optical device 100 will be described with reference to FIGS.

  The optical module 10 is a wavelength tunable semiconductor laser module including a wavelength tunable semiconductor laser element 11 as shown in FIG. The optical module 10 outputs laser light having a desired wavelength and power from the optical fiber 12. The optical module 10 has a configuration in which a wavelength tunable semiconductor laser element is integrated with a plurality of semiconductor lasers, an optical combiner, and a semiconductor optical amplifier as disclosed in Non-Patent Document 1 and Patent Document 1, for example. . The optical module 10 includes a known wavelength lock mechanism using an etalon filter for controlling the wavelength of the wavelength tunable semiconductor laser element 11. Further, the optical module 10 includes a temperature adjusting element and a temperature monitoring element for adjusting the temperature of each of the wavelength tunable semiconductor laser element 11 and the etalon filter. The optical module 10 includes an electric pin 13 for inputting a drive current for the wavelength tunable semiconductor laser element 11 and the temperature adjusting element, and for outputting a temperature monitor signal and an optical power monitor signal and a wavelength monitor signal in the wavelength lock mechanism. ing. The electric pins 13 are electrically connected to the printed circuit board 20.

  The printed board 20 is formed with a notch 21 for placing the optical module 10 (see FIG. 3). The printed circuit board 20 is mounted with a control circuit 22 that controls the optical module 10. 2 and 3 show only some components of the control circuit 22. The control circuit 22 is electrically connected to a host device (not shown) via the connector pin 23, and supplies drive current to the optical module 10 based on various monitor signals output from the optical module 10. Control the behavior. The control circuit 22 includes a digital arithmetic device, a memory, a current control circuit, a temperature monitor circuit, an optical power monitor circuit, a wavelength monitor circuit, and the like. The printed circuit board 20 is formed with a wiring pattern that interconnects the components of the control circuit 22, or these components, the electrical pins 13 and the connector pins 23 of the optical module 10.

  Further, four openings 24 for fixing the printed board 20 and the first plate-like member 30 are formed in the printed board 20. In the first embodiment, the opening 24 has a U-shaped notch shape. In addition, a terminal pattern 25 is provided around the notch 21 so that the printed circuit board 20 is electrically connected to the electrical pins 13 of the optical module 10.

  The first plate-like member 30 is a plate-like member to which the printed board 20 is attached and fixed. The first plate-like member 30 is made of a material having a high thermal conductivity such as a metal such as aluminum or a ceramic, but the material is not particularly limited.

  As shown in FIG. 3, the first plate member 30 is formed with a recess 31 in which the optical module 10 is disposed. The first plate-like member 30 includes four convex portions 32 that come into contact with the printed circuit board 20. The convex portions 32 are formed at positions where the portions where the four openings 24 of the printed circuit board 20 are formed abut each of the four convex portions 32 when the printed circuit board 20 is placed on the first plate-like member 30. Has been. Each convex portion 32 is formed with a screw hole 33 in which a screw thread is formed.

  The four first screw members 40 made of metal or ceramic are respectively inserted into the openings 24 of the printed circuit board 20 to fix the printed circuit board 20 and the first plate-shaped member 30.

  As shown in FIG. 5A, the first screw member 40 includes a substantially cylindrical head portion 41 and a screw portion 42 that is an embodiment of a fixing portion and is a male screw. The head 41 is formed with a slit 41a and a screw hole 41b which is a female screw having a thread formed on the inner wall. The screw hole 41b is a through-hole penetrating along the central axis. Note that the screw thread does not need to be formed over the entire depth direction of the screw hole 41b, and may be formed in a predetermined range so that the second screw member 60 can be screwed as described later. Moreover, the inner diameter of the part in which the screw thread is formed in the screw hole 41b and the inner diameter of the other part may be different or the same. For example, the inner diameter of the portion of the screw hole 41b where the screw thread is formed may be larger, smaller, or the same as the inner diameter of the other portion.

  The second plate-like member 50 is disposed on the opposite side of the first plate-like member 30 with the printed circuit board 20 in between. The second plate-like member 50 is made of a material having a high thermal conductivity such as a metal such as aluminum or a ceramic, but the material is not particularly limited.

  As shown in FIG. 1, the second plate member 50 has a recess 51 in which the optical module 10 is disposed. The second plate member 50 is formed with four counterbore holes 52 through which the second screw member 60 is inserted, as will be described in detail later. The counterbore 52 is formed at a position corresponding to each of the four first screw members 40. The second plate member 50 is formed with a notch 53 so that the connector pin 23 of the printed circuit board 20 and the second plate member 50 do not interfere with each other. Further, the connector pin 23 does not protrude from the surface of the second plate-like member 50 (the surface opposite to the surface facing the printed circuit board 20).

  The four second screw members 60 made of a metal material or ceramic fix the first screw member 40 and the second plate member 50. As shown in FIG. 5B, the second screw member 60 is an embodiment of a substantially cylindrical head 61 and a fixed portion, and is a screw portion that is a male screw that can be screwed into the screw hole 41 b of the first screw member 40. 62. The head 61 is formed with a cross hole 61a. Further, the second screw member 60 is formed with a through hole 63 penetrating along the central axis.

  The four second screw members 60 fix the first screw member 40 and the second plate member 50. The four second screw members 60 fix the four first screw members 40 and the second plate member 50, so that the optical module 10 is sandwiched between the first plate member 30 and the second plate member 50. The

  2 and 4, radiators 71 and 72 are interposed between the optical module 10 and the first plate member 30 and between the optical module 10 and the second plate member 50, respectively. doing. The radiators 71 and 72 act so that heat generated by the optical module 10 can be easily radiated to the first plate member 30 and the second plate member 50. The radiator is made of, for example, a resin or graphite having good heat dissipation, and may be a thin sheet (heat radiating sheet) or a relatively thick pad (heat radiating pad). Further, it may be a heat-release grease. The radiators 71 and 72 may be made of the same material, or may be made of different materials. In the example described above, the radiators 71 and 72 may be made of a pad-like resin, the radiator 71 may be a sheet-like graphite sheet, and the radiator 72 may be a thermal grease.

(Assembly method)
A method for assembling the optical device 100 will be described with reference to FIGS.
First, as shown in FIG. 3, the printed circuit board 20 is placed on the first plate-like member 30. At this time, each opening 24 of the printed circuit board 20 and each screw hole 33 of the first plate-like member 30 corresponding to each opening 24 are placed in alignment.

  Subsequently, as shown in FIG. 6, the first screw member 40 is inserted into each opening 24 of the printed circuit board 20, and the screw portion 42 of the first screw member 40 is connected to the first plate-like member 30 using a flathead screwdriver or the like. The screw hole 33 is screwed. The printed circuit board 20 and the first plate-shaped member 30 are fixed by the projection 32 of the first plate-shaped member 30 and the head 41 of the first screw member 40 coming into contact with the printed circuit board 20. Further, a heat radiator 71 is provided in the recess 31 of the first plate-like member 30 before or after fixing.

  Next, as shown in FIG. 2 and FIG. 4, the optical module 10 having the heat radiating body 72 provided on one side is prepared, and the optical module 10 is disposed in the concave portion 31 of the first plate-like member 30 via the heat radiating body 71. To do. At this time, each electrical pin 13 of the optical module 10 is brought into contact with each terminal pattern 25 of the printed circuit board 20. At this time, solder bonding between the electric pin 13 and the terminal pattern 25 may be performed.

  Subsequently, the second plate-like member 50 is placed on the first screw member 40. At this time, the screw holes 41b of the first screw member 40 and the counterbore holes 52 of the second plate-like member 50 corresponding to the screw holes 41b are placed in alignment.

  Subsequently, the second screw member 60 is inserted into each counterbore hole 52, and the screw portion 62 of the second screw member 60 is screwed into the screw hole 41 b of the head 41 of the first screw member 40. When the head 41 of the first screw member 40 and the head 61 of the second screw member 60 abut on the second plate member 50, the first screw member 40 and the second plate member 50 are fixed. . The head 61 of each second screw member 60 is accommodated in each counterbore 52, but the upper end surface of the head 61 and the surface of the second plate-like member 50 are substantially flush with each other. It does not protrude from the surface of the second plate member 50. Thereby, the assembly of the optical device 100 is completed.

  Here, as shown in FIG. 8, the opening 24 is formed so that the outer periphery of the head portion 41 of the first screw member 40 abuts the printed circuit board 20 with a length of ½ or more of the length in the outer peripheral direction D. Yes. Thereby, the contact area between the head 41 and the printed circuit board 20 is sufficient, and the printed circuit board 20 is more reliably fixed. In addition, it is preferable that the shape of the opening 24 is a shape in which the head 41 of the first screw member 40 abuts the printed circuit board 20 with a length that is 1/2 or more of the length in the outer circumferential direction D.

  In the optical device 100 according to the first embodiment, the printed circuit board 20 is fixed to the first plate member 30 by the first screw member 40, and the first screw member 40 and the second plate member 50 are fixed by the second screw member 60. The optical module 10 is sandwiched and fixed by the first plate member 30 and the second plate member 50. Thereby, compared with the conventional structure described in Non-Patent Document 1, the number of fixing structures for fixing the printed circuit board and the optical module to the plate-like member is reduced. As a result, the printed circuit board 20 has few regions where electronic components cannot be arranged and pattern wiring is possible due to the presence of the fixed structure. Furthermore, the printed circuit board 20 can be arranged in the optical device 100 also in the region where the fixing structure is provided for fixing the optical module in the conventional structure. As a result, the area of the printed circuit board 20 can be increased and the area available for mounting on the printed circuit board 20 can be increased, so that the mounting area can be made wider than that of the conventional structure.

  Further, the printed circuit board 20 is sandwiched and fixed between the convex portion 32 of the first plate member 30 and the head portion 41 of the first screw member 40. As a result, the optical device 100 does not cause backlash of the printed circuit board 20, and the printed circuit board 20 does not move relative to the first plate member 30 or the first screw member 40 even if there is vibration or impact. The optical device 100 is resistant to vibration and impact.

  In the optical device 100, the first screw member 40 is formed with a screw hole 41b as a through hole, and the second screw member 60 is formed with a through hole 63. The screw hole 41b and the through hole 63 communicate with each other. Through holes are formed. This through hole can be used when attaching the optical device 100 to another member such as a heat sink or an attachment target such as a device. In the conventional structure, such a through-hole structure and a fixing structure are configured as separate members. However, in the optical device 100, the fixing structure and the through-hole structure are integrated. The mounting area can be further increased.

  In the optical device 100, neither the second screw member 60 nor the connector pin 23 protrudes from the surface of the second plate member 50. Accordingly, when the optical device 100 is attached to the attachment target on the second plate-like member 50 side, a gap due to interference between the second screw member 60 and the attachment target is provided between the second plate-like member 50 and the attachment target. Can not. Further, when the connector pin 23 is connected to the female connector provided on the attachment target, the connector pin 23 hits the bottom of the fitting hole of the female connector and cannot be inserted any more, and the second plate member 50 and the attachment target It is possible to prevent or greatly suppress the occurrence of a situation where a gap is formed between the two. Even if a gap is generated, the width of the gap is relatively narrow. As a result, it is possible to save space in the stacking direction (height direction) of the first plate-like member 30, the printed board 20, and the second plate-like member 50 when the optical device 100 is attached to the attachment target.

  Further, in the optical device 100, as shown in FIG. 9, when the height from the surface of the printed board 20 (the surface facing the second plate member 50) to the surface of the second plate member 50 is a height h1. The height h1 is determined by the sum of the thickness of the second plate member 50 and the height of the head 41 of the first screw member 40. Since the second plate member 50 and the first screw member 40 are made of metal or ceramic, the thickness of the second plate member 50 and the height of the head 41 of the first screw member 40 can be produced with high dimensional accuracy. Therefore, the height h1 can be high in dimensional accuracy. If the height h1 can be set to a high dimensional accuracy, an error from the design value of the height from the tip of the connector pin 23 to the surface of the second plate-like member 50 (the height h2) is also reduced. The tolerance can be set small. Further, since the error from the design value of the height from the root of the connector pin 23 to the surface of the second plate-like member 50 (denoted as height h3) is reduced, the tolerance of the height h3 can be set small. . Further, if the errors of the heights h2 and h3 are small, there is a situation in which a gap is formed between the second plate member 50 and the attachment target when the connector pin 23 is connected to the female connector provided on the attachment target. Generation | occurrence | production can be prevented or suppressed significantly. Even if a gap is generated, the width of the gap is relatively narrow. In addition, it is possible to prevent or greatly suppress the occurrence of a situation where the heights h2 and h3 are too large and the insertion length of the connector pin 23 into the female connector is insufficient, resulting in insufficient electrical connection.

(Modification)
FIG. 10A is a schematic perspective view illustrating a configuration of an optical device 101 according to a modification of the first embodiment. FIG. 10B is a partially enlarged view of FIG. 10A. Since the optical device 101 has the same configuration except that the second screw member 60 is replaced with the second screw member 60A in the configuration of the optical device 100 according to the first embodiment, the second screw member 60A will be described below. .

  The second screw member 60A is lower in the height of the head than the second screw member 60 shown in FIG. 5B than the height of the head 61 of the second screw member 60. Therefore, in a state where the screw portion of the second screw member 60A is screwed into the screw hole 41b of the head portion 41 of the first screw member 40 and the head portion of each second screw member 60A is accommodated in each counterbore hole 52. 10A and 10B, the upper end surface of the head of the second screw member 60A is lower than the surface of the second plate member 50. As a result, when the optical device 101 is attached to the attachment target on the second plate-like member 50 side, a gap due to interference between the second screw member 60A and the attachment target is present between the second plate-like member 50 and the attachment target. Can not.

(Embodiment 2)
FIG. 11 is a schematic perspective view illustrating the configuration of the optical device according to the second embodiment. As shown in FIG. 11, the optical device 100A includes an optical module 10, a printed circuit board 20A, a first plate-like member 30A, four screw members 80 that are one mode of the first fixing member, and a second plate-like shape. The member 50A and at least four nut members 90 which are one mode of the second fixing member are provided.

  12 is a partial cross-sectional view taken along line BB in FIG. FIG. 13 is a schematic diagram of the screw member 80. Hereinafter, the optical device 100A will be described with reference to FIGS. Since the optical module 10 is the same as the optical module 10 of the optical device 100, the description thereof is omitted.

  Similar to the printed circuit board 20, the printed circuit board 20 </ b> A has a notch 21 </ b> A for placing the optical module 10. The printed circuit board 20 </ b> A is equipped with a control circuit (not shown) that controls the optical module 10. The control circuit is electrically connected to a host device (not shown) via the connector pin 23A, supplies a drive current to the optical module 10 based on various monitor signals output from the optical module 10, and operates the optical module 10. To control. The printed circuit board 20A is formed with a wiring pattern that interconnects the components of these control circuits, or these components, the electrical pins 13 of the optical module 10, and the connector pins 23A.

  In addition, four openings 24A for fixing the printed circuit board 20A and the first plate-like member 30A are formed in the printed circuit board 20A. In the second embodiment, the opening 24A is a through hole formed in the printed board 20A. A terminal pattern for electrically connecting the printed circuit board 20 </ b> A to the electrical pins 13 of the optical module 10 is provided around the notch 21 </ b> A.

  The first plate-like member 30A is a plate-like member to which the printed board 20A is attached and fixed. The first plate member 30A is made of a material having high thermal conductivity such as metal or ceramic, but the material is not particularly limited.

  The first plate member 30A is formed with a recess 31A in which the optical module 10 is disposed. Further, the first plate-like member 30A includes four convex portions 32A that come into contact with the printed circuit board 20A. The protrusions 32A are formed at positions where the portions where the four openings 24A of the printed circuit board 20A are formed contact the four protrusions 32A when the printed circuit board 20A is placed on the first plate member 30A. ing. Each convex portion 32A is formed with a screw hole 33A in which a screw thread is formed.

  As shown in FIG. 13, the four screw members 80 made of a metal material or ceramic are one mode of the first screw portion 81 that is one mode of the first fixing portion and one mode of the second fixing portion. It has the formed 2nd screw part 82 and the large diameter part 83 located between the 1st screw part 81 and the 2nd screw part 82. As shown in FIG. As shown in FIG. 12, the first screw portion 81 is inserted through the opening 24A of the printed board 20A, and fixes the printed board 20A and the first plate-like member 30A. Further, the screw member 80 is formed with a through hole 84 penetrating along the central axis.

  The second plate-like member 50A is arranged so as to sandwich the printed board 20A together with the first plate-like member 30A. The second plate-like member 50A is made of a material having high thermal conductivity such as metal or ceramic, but the material is not particularly limited.

  The second plate member 50A is formed with a recess 51A in which the optical module 10 is disposed. The second plate-like member 50A is formed with four countersink holes 52A through which the second screw portions 82 of the screw members 80 are inserted and the nut members 90 are accommodated. Each counterbore 52A is formed at a position where each second screw portion 82 is inserted. Further, the second plate-like member 50A is formed with a notch 53A so that the connector pin 23A of the printed circuit board 20A and the second plate-like member 50A do not interfere with each other. Further, the connector pin 23A does not protrude from the surface of the second plate-like member 50A (the surface opposite to the surface facing the printed circuit board 20A).

  Each nut member 90 is screwed into the second screw portion 82 of each screw member 80, so that the optical module 10 is sandwiched between the first plate member 30A and the second plate member 50A. The member 80 and the second plate member 50A are fixed.

  Specifically, each first screw portion 81 is screwed into each screw hole 33A of the first plate-like member 30A, and the first plate-like member 30A and each large-diameter portion 83 come into contact with the printed circuit board 20A. The printed circuit board 20A and the first plate-like member 30A are fixed. Further, each nut member 90 is screwed into each second screw portion 82 of each screw member 80, and each nut member 90 and each large diameter portion 83 abut against the second plate member 50A, thereby each screw member. 80 and the second plate-like member 50A are fixed. Each nut member 90 is accommodated in each counterbore hole 52A, but the upper end surface of the nut member 90 is substantially flush with or lower than the surface of the second plate member 50A. It does not protrude from the surface of the plate-like member 50A.

  In the optical device 100A, as in the first embodiment, the radiators are interposed between the optical module 10 and the first plate member 30A and between the optical module 10 and the second plate member 50A, respectively. doing.

  Also in the optical device 100A according to the second embodiment, the number of fixing structures for fixing the printed circuit board and the optical module to the plate-like member is reduced as compared with the conventional structure described in Non-Patent Document 1. As a result, the area of the printed circuit board 20A itself can be increased, and the area available for mounting on the printed circuit board 20A can be increased, so that the mounting area can be made wider than that of the conventional structure.

  Further, in the optical device 100 </ b> A, a through hole 84 is formed in the screw member 80. The through hole 84 can be used when the optical device 100A is attached to an attachment target. Thereby, similarly to Embodiment 1, the mounting area of the printed circuit board 20A can be further increased.

  In addition, since the printed circuit board 20A is sandwiched and fixed by the convex portion 32A of the first plate-shaped member 30A and the large diameter portion 83 of the screw member 80, the optical device 100A is a printed circuit as in the case of the first embodiment. The backlash of the substrate 20A does not occur and is resistant to vibration and impact.

  Further, in the optical device 100A, since neither the nut member 90 nor the connector pin 23A protrudes from the surface of the second plate-like member 50A, the optical device 100A is attached to the attachment target as in the case of the first embodiment. In this case, the space can be saved.

  In the optical device 100A, the height from the surface of the printed board 20A (the surface facing the second plate member 50A) to the surface of the second plate member 50A is determined by the thickness of the second plate member 50A and the screw member. It is determined by the sum of the heights of the 80 thick-diameter portions 83, and high dimensional accuracy can be achieved. Thereby, similarly to the case of the first embodiment, the optical device 100A can prevent or greatly suppress the occurrence of a gap and insufficient electrical connection when the connector pin 23A is connected to the female connector to be attached. .

(Embodiment 3)
FIG. 14 is a schematic perspective view illustrating the configuration of the optical device according to the third embodiment. In the configuration of the optical device 100 shown in FIG. 1, the optical device 100B replaces the second plate-like member 50 with the second plate-like member 50B, and two of the four first screw members 40 are the first screw members 40B. In the configuration, two of the four second screw members 60 are deleted.

  The second plate-like member 50B is long enough to hold the optical module 10 between the first plate-like member 30 and the second plate-like member 50B in the length direction. For example, the second plate-like member 50B is approximately the same as the length of the optical module 10. Has a length of As a result, the second plate-like member 50B does not interfere with the connector pins 23 of the printed circuit board 20 without forming a notch. The first screw member 40B has substantially the same shape as the first screw member 40. The first screw member 40B is formed with a through hole 43B that penetrates from the head 41B along the central axis. A thread may not be formed on the inner wall of the through hole 43B.

  In the optical device 100B, the printed circuit board 20 is fixed to the first plate-shaped member 30 by the two first screw members 40 and the two first screw members 40B, and the two first screws are formed by the two second screw members 60. The member 40 and the second plate member 50B are fixed. Thereby, the optical module 10 is sandwiched and fixed by the first plate member 30 and the second plate member 50B. As a result, the mounting area of the printed circuit board 20 can be further increased as in the first embodiment. Further, similarly to the first embodiment, it is resistant to vibration and impact, and space saving is possible when the optical device 100B is attached to the attachment target. When the connector pin 23 is connected to the female connector to be attached, Generation of gaps and insufficient electrical connection can be prevented or greatly suppressed.

(Modifications of the first fixing member and the second fixing member)
In the above embodiment, the first fixing member and the second fixing member are screw members or nut members, and the fixing is performed by screwing. However, the fixing performed by the first fixing member and the second fixing member is by screwing. It is not limited to things.

FIG. 15 is a schematic cross-sectional view illustrating Modification 1 of the first fixing member and the second fixing member.
The first plate member 30 </ b> C includes four convex portions 32 </ b> C that come into contact with the printed circuit board 20. The convex portions 32C are formed at positions where the portions where the four openings 24 of the printed circuit board 20 are formed contact with the four convex portions 32C, respectively, when the printed circuit board 20 is placed on the first plate-like member 30C. Has been. Moreover, the through-hole 33C is formed in each convex part 32C. Furthermore, a concave portion 34C is formed at a position facing each convex portion 32C.

  The first fixing member 40C is a rivet having a substantially cylindrical head portion 41C and an aspect of the fixing portion, and a substantially cylindrical trunk portion 42C. The first fixing member 40C is inserted into each opening 24 of the printed circuit board 20 and each through hole 33C of the first plate-like member 30C, and the tip of the trunk portion 42C is caulked, so that the tip of the trunk portion 42C is the bottom surface of the recess 34C. The printed circuit board 20 and the first plate-shaped member 30C are fixed by contacting the printed circuit board 20 with the convex portion 32C of the first plate-shaped member 30C and the head portion 41C of the first fixing member 40C. .

  The second plate-like member 50C is arranged on the opposite side of the first plate-like member 30C with the printed circuit board 20 in between. The second plate member 50C is formed with four countersink holes 52C through which the second fixing member 60C is inserted, as will be described in detail later. The counterbore 52C is formed at a position corresponding to each of the four first fixing members 40C.

  The second fixing member 60C includes a substantially cylindrical head portion 61C and an aspect of the fixing portion, and includes a body portion 62C that can be fixed to the head portion 41C of the first fixing member 40C.

  The second fixing member 60C is inserted into each counterbore hole 52C of the second plate-like member 50C, and the body portion 62C of the second fixing member 60C is fixed to the head portion 41C of the first fixing member 40C. This fixing can be performed by using an adhesive, press-fitting, shrink fitting, or the like. When the head portion 41C of the first fixing member 40C and the head portion 61C of the second fixing member 60C abut on the second plate-like member 50C, the first fixing member 40C and the second plate-like member 50C are fixed. .

FIG. 16 is a schematic cross-sectional view illustrating Modification 2 of the first fixing member and the second fixing member.
80 A of 1st fixing members are 1 aspect of a 1st fixing | fixed part, and are the substantially cylindrical 1st trunk | drum 81A, the 1st aspect of a 2nd fixing | fixed part, the substantially cylindrical 2nd trunk | drum 82A, A large-diameter portion 83A located between the first body portion 81A and the second body portion 82A is provided. The first body 81A of the first fixing member 80A is inserted into the openings 24 of the printed circuit board 20 and the through holes 33C of the first plate member 30C, and the first body 81A is caulked at the tip, thereby The front end of the body portion 81A comes into contact with the bottom surface of the concave portion 34C, and the convex portion 32C and the large-diameter portion 83A of the first plate-like member 30C come into contact with the printed board 20, whereby the printed board 20 and the first plate-like member 30C. And are fixed.

  90 A of 2nd fixing members are comprised so that fixing to the 2nd trunk | drum 82A of 80 A of 1st fixing members is possible.

  The second body 82A of the first fixing member 80A is inserted into each counterbore 52C of the second plate-like member 50C, and the second fixing member 90A is fixed to the second body 82A. This fixing can be performed by using an adhesive, press-fitting, shrink fitting, or the like. The first fixing member 80A and the second plate member 50C are fixed by the large diameter portion 83A of the first fixing member 80A and the second fixing member 90A coming into contact with the second plate member 50C.

  In the above embodiment, the optical module is a wavelength tunable semiconductor laser module incorporating a wavelength tunable semiconductor laser element. However, the optical module is not limited to the wavelength tunable semiconductor laser module. For example, the optical module may be an optical module including a wavelength tunable laser other than the semiconductor laser element, a semiconductor laser not having a wavelength tunable function, and other optical elements such as a light receiving element and an optical modulator.

  Moreover, in the said embodiment, although the heat radiator is interposing between both between an optical module and a 1st plate-shaped member, and between an optical module and a 2nd plate-shaped member, a heat radiator is interposed in at least one. You may do it. Moreover, the 1st plate-shaped member and the 2nd plate-shaped member may be a flat thing in which the recessed part is not formed, or the convex part may be formed instead of the recessed part.

  In the case where the optical module does not need to dissipate heat from at least one of the first plate-like member and the second plate-like member, between the optical module and the first plate-like member and between the optical module and the second plate. An elastic member may be interposed between at least one of the plate members. Examples of the elastic member include, for example, a sheet-like thin member made of rubber, silicone, or foamed resin, a pad-like thin member, and a grease.

  Further, when the optical module is configured to dissipate heat from one of the first plate member and the second plate member, a heat radiator is interposed between the heat dissipating plate member to dissipate heat. An elastic member may be interposed between the plate-like member on the side that may not be provided.

  In the second embodiment, the opening formed in the printed board is a hole, but it may be a notch-shaped opening similar to the first embodiment. In that case, it is preferable that the large-diameter portion of the screw member has a notch shape that makes contact with the printed circuit board at a half or more of the length in the outer peripheral direction.

  Further, the present invention is not limited by the above embodiment. What was comprised combining each component mentioned above suitably is also contained in this invention. Further effects and modifications can be easily derived by those skilled in the art. Therefore, the broader aspect of the present invention is not limited to the above-described embodiment, and various modifications can be made.

DESCRIPTION OF SYMBOLS 10 Optical module 11 Wavelength variable semiconductor laser element 12 Optical fiber 13 Electric pin 20, 20A Printed circuit board 21, 21A Notch part 22 Control circuit 23, 23A Connector pin 24, 24A Opening 25 Terminal pattern 30, 30A, 30C 1st plate shape Member 31, 31A, 34C, 51, 51A Concave portion 32, 32A, 32C Convex portion 33, 33A Screw hole 33C Through hole 40, 40B First screw member 40C, 80A First fixing member 41, 41B, 41C, 61, 61C Head Part 41a, 82a Slot 41b Screw hole 42, 62 Screw part 42C, 62C Body 43B Through hole 50, 50A, 50B, 50C Second plate-like member 52, 52A, 52C Counter bore 53, 53A Notch 60, 60A Second screw member 60C, 90A Second fixing member 61a Cross hole 63, 84 Through hole 71, 7 Heat radiating body 80 screw member 81 first threaded portion 81A first barrel 82 second threaded portion 82A second barrel 83,83A large-diameter portion 90 nut member 100,101,100A, 100B light device D the outer circumferential direction

Claims (20)

An optical module with electrical pins;
A printed circuit board on which electrical pins of the optical module are connected, a control circuit for controlling the optical module is mounted, and an opening is formed;
A first plate-like member to which the printed circuit board is attached;
A first fixing member that is inserted through the opening of the printed circuit board and fixes the printed circuit board and the first plate member;
A second plate member disposed on the opposite side of the first plate member across the printed circuit board;
A second fixing member that fixes the first fixing member and the second plate member so that the optical module is sandwiched between the first plate member and the second plate member;
An optical device comprising: Connector pins are provided on the printed circuit board,
2. The optical device according to claim 1, wherein none of the second fixing member and the connector pin protrudes from a surface of the second plate-like member opposite to the surface facing the printed circuit board. . The first fixing member has a head portion and a fixing portion, and the fixing portion of the first fixing member is fixed to the first plate-like member, and the first plate-like member and the head of the first fixing member. Part is in contact with the printed circuit board, the printed circuit board and the first plate member are fixed,
The second fixing member has a head and a fixing portion, and the fixing portion of the second fixing member is fixed to the head of the first fixing member, and the head of the first fixing member and the second The first fixing member and the second plate-like member are fixed when the head of the fixing member comes into contact with the second plate-like member. Light equipment.   4. The optical device according to claim 3, wherein the head of the first fixing member is in contact with the printed circuit board with a length of ½ or more of the length in the outer circumferential direction. The first fixing member has a head portion and a fixing portion that is a screw portion on which a screw is formed, or the second fixing member is a fixing portion that is a head portion and a screw portion on which a screw is formed. The optical device according to claim 1, further comprising: 5. The optical device according to claim 3, wherein, in the first fixing member or the second fixing member, the fixing portion is a screw portion in which a screw is formed. The first fixing member has a head portion and a fixing portion that is a screw portion formed with a screw, and the second fixing member is a fixing portion that is a head portion and a screw portion formed with a screw. The optical device according to claim 1, further comprising: 5. The optical device according to claim 3, wherein, in the first fixing member and the second fixing member, the fixing portion is a screw portion in which a screw is formed. The screw portion of the first fixing member is a male screw, a screw hole is formed in the head portion of the first fixing member, and the screw portion of the second fixing member is the head portion of the first fixing member. optical device according to claim 7 or claim 8, characterized in that a male screw to be screwed into the screw hole. The optical device according to any one of claims 1 to 9 , wherein the first fixing member and the second fixing member are formed with a through-hole penetrating along a central axis. The first fixing member has a first fixing portion and a second fixing portion, and the first fixing portion is inserted through an opening of the printed board to fix the printed board and the first plate-like member. And
The second fixing member is fixed to the second fixing portion of the first fixing member, so that the optical module is sandwiched between the first plate member and the second plate member. The optical device according to claim 1, wherein the first fixing member and the second plate-like member are fixed. The first fixing member has a large diameter portion located between the first fixing portion and the second fixing portion, and the first fixing portion is fixed to the first plate-like member, When the plate-like member and the large-diameter portion abut against the printed board, the printed board and the first plate-like member are fixed,
The second fixing member is fixed to the second fixing portion of the first fixing member, and the second fixing member and the large-diameter portion abut on the second plate-like member, whereby the first fixing member The optical device according to claim 11 , wherein the second plate-like member is fixed. The optical device according to claim 12 , wherein the large-diameter portion of the first fixing member is in contact with the printed circuit board with a length equal to or greater than ½ of a length in an outer peripheral direction. The said 1st fixing member WHEREIN: The said 1st fixing | fixed part and the said 2nd fixing | fixed part are the screw parts in which the screw was formed, The said 2nd fixing member is a nut member, The Claim 11 characterized by the above-mentioned. 14. The optical device according to any one of 13 . The first fixing member, the optical device according to any one of claims 14 claim 11, characterized in that the through-hole penetrating along the central axis are formed. 2. A heat radiator is interposed between at least one of the optical module and the first plate member and between the optical module and the second plate member. 15. The optical device according to any one of 15 . The optical device according to claim 16 , wherein the heat radiating member is a heat radiating pad, a heat radiating sheet, or a heat radiating grease. 2. An elastic member is interposed between at least one of the optical module and the first plate member and between the optical module and the second plate member. The optical device according to any one of 17 . The optical module optical device according to any one of claims 1 to 18, characterized in that it comprises a semiconductor laser. The optical module optical device according to any one of claims 19 claim 1, characterized in that it comprises a tunable laser.

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