JP2014178383A - Communication module and signal transmission device provided with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure a space usable for various applications between a substrate and a communication module mounted on the substrate.SOLUTION: A communication module 10 to be mounted on a mother board 3 in a signal transmission device includes a lower plate 31a and an upper plate 32a that face each other, and has: a module casing 11 that has a module substrate 34 accommodated between the lower plate 31a and the upper plate 32a; and a male connector 60 that protrudes from the lower plate 31a, and is connected to a female connector 50 provided on the mother board 3. When the male connector 60 is connected to the female connector 50, a gap 70 is formed between the lower plate 31a of the module casing 11 and the mother board 3.

Description

  The present invention relates to a communication module used for signal transmission between substrates in an electronic device and signal transmission between electronic devices, and a signal transmission device including the communication module.

  A general signal transmission device has a substrate on which a semiconductor element (IC chip) and a communication module are mounted. In the following description, the substrate on which the IC chip and the communication module are mounted may be referred to as a “mother board”.

  A conventional communication module has a module housing, and a module substrate on which an IC, an optical element, and the like are mounted is accommodated in the module housing. In addition, a plurality of terminal pads electrically connected to the module substrate are provided in a lattice shape on the bottom surface of the module housing. Here, the bottom surface of the module housing is a surface facing the mounting surface of the motherboard when the communication module is mounted on the motherboard.

  When a communication module having the above structure is mounted on a motherboard, an interposer is disposed between the bottom surface of the module housing and the mounting surface of the motherboard. That is, the communication module and the motherboard are electrically connected via the interposer. Usually, the communication module overlaid on the interposer is pressed against the interposer by a spring.

JP 2010-175995 A

  In a conventional communication module, terminal pads are provided over substantially the entire area of the bottom surface of the module housing. The communication module and the motherboard are electrically connected via an interposer disposed between the bottom surface of the module housing and the mounting surface of the motherboard. That is, there is almost no gap between the communication module and the motherboard. More specifically, there is almost no gap between the bottom surface of the module housing and the mounting surface of the motherboard.

  Therefore, the connection between the communication module and the optical fiber must be performed on the upper surface (the surface opposite to the bottom surface) of the module housing. Specifically, an optical connector is required to connect the communication module and the optical fiber, but this optical connector must be disposed on the upper surface of the module housing.

  On the other hand, the amount of heat generated by the communication module tends to increase as the signal input / output to / from the communication module increases, and there is a demand for improvement in heat dissipation efficiency and cooling efficiency of the communication module.

  However, when a conventional communication module is mounted on a motherboard, there is almost no gap between the bottom surface of the module housing and the mounting surface of the motherboard, and an optical connector is disposed on the top surface of the module housing. ing. For this reason, the effective heat radiation area on the surface of the module housing is small, and the cooling air hardly hits the surface of the module housing. That is, it is difficult to say that the heat dissipation efficiency and cooling efficiency of the conventional communication module are good.

  Furthermore, when a heat sink is arranged on the communication module, it is necessary to arrange the heat sink while avoiding the optical connector arranged on the upper surface of the module housing. That is, the area of the upper surface of the module housing that is thermally connected to the heat sink is limited to the area that is not covered by the optical connector.

  An object of the present invention is to secure a space that can be used for various purposes such as heat dissipation, cooling, and cable connection between a substrate and a communication module mounted on the substrate.

  The communication module of the present invention is a communication module mounted on a substrate in a signal transmission device, and includes a lower plate and an upper plate facing each other, and the module substrate is accommodated between the lower plate and the upper plate. A module housing, and a second connector protruding from the lower plate and connected to the first connector provided on the substrate, and when the second connector is connected to the first connector, A gap is formed between the lower plate and the substrate of the module housing.

  In one aspect of the present invention, a communication cable is drawn from the lower plate of the module housing.

  In another aspect of the present invention, a light emitting element provided on the module substrate, an optical fiber as the communication cable, and a connection for changing a traveling direction of light emitted from the light emitting element and entering the optical fiber Are provided.

  In another aspect of the present invention, a light receiving element provided on the module substrate, an optical fiber as the communication cable, and a connection for changing a traveling direction of light emitted from the optical fiber and entering the light receiving element Are provided.

In another aspect of the present invention, a metal plate disposed between the upper plate of the module housing and the module substrate is provided, and the light emitting element or the light receiving element is interposed in the module housing via the metal plate. Thermally connected to the body.
In another aspect of the present invention, the optical fiber is connected to a part of the connection portion protruding from the lower plate.

  In another aspect of the invention, the second connector has a protruding portion that protrudes from the lower plate and extends linearly along one side of the lower plate, and the first side surface and the first side surface of the protruding portion. An electrode array composed of a plurality of electrodes formed at regular intervals along the longitudinal direction of the projecting portion is provided on each of the second side surfaces that face each other.

  The signal transmission device of the present invention is a signal transmission device including a substrate on which a semiconductor element and a communication module are mounted, and the communication module includes a lower plate and an upper plate facing each other, and the lower plate and the upper plate, A module housing in which a module substrate is accommodated, and a second connector protruding from the lower plate and connected to a first connector provided on the substrate, and the lower portion of the module housing A gap is formed between the plate and the substrate.

  In one aspect of the present invention, a heat sink placed on the upper plate of the module housing of the communication module is provided.

  According to the present invention, a space that can be used for various purposes such as heat dissipation, cooling, and cable connection is secured between a substrate and a communication module mounted on the substrate.

It is an exploded perspective view showing an example of a signal transmission device to which the present invention is applied. (A) is a top view of the signal transmission apparatus shown by FIG. 1, (B) is a side view. (A) is an enlarged plan view of the communication module shown in FIG. 1, (B) is an enlarged side view, and (C) is an enlarged bottom view. It is an expanded sectional view of the communication module shown by FIG. FIG. 2 is an enlarged perspective view of a male connector and a female connector shown in FIG. 1. (A) is a cross-sectional view of the male connector along the line AA shown in FIG. 5, (B) is a cross-sectional view of the female connector along the line BB shown in FIG. 5, (C) is It is sectional drawing which shows the fitting state of a male connector and a female connector.

  Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings. The signal transmission device 1 shown in FIGS. 1 and 2 constitutes a substrate (motherboard 3) on which a semiconductor element (IC chip 2) and a plurality of communication modules 10 are mounted, and a cooling mechanism for cooling the communication modules 10. Heat sink 20. The heat sink 20 includes a heat absorption plate 21 having a substantially rectangular planar shape and a plurality of heat radiation fins 22 provided on the heat absorption plate 21. The heat absorbing plate 21 and the heat radiating fins 22 are integrally formed of a metal (aluminum, copper, etc.) excellent in thermal conductivity.

  In the present embodiment, four communication modules 10 are arranged in a row in the vicinity of one side (long side) of the IC chip 2 in parallel to the one side. On the plurality of communication modules 10, a heat sink 20 is placed so that one side (long side) of the heat absorbing plate 21 is parallel to the one side of the IC chip 2.

  As shown in FIGS. 3A to 3C, each communication module 10 has a module housing 11. The module housing 11 has two pairs of opposing sides (sides 11a and 11b, sides 11c and 11d), and has a substantially square appearance in a plan view and a bottom view. The length of each side of the module housing 11 is 10 mm to 30 mm. However, the length of each side of the module housing 11 can be arbitrarily set, and is not limited to the above numerical range. Further, the planar shape and bottom shape of the module housing 11 are not limited to a square or a substantially square shape.

  As shown in FIG. 4, the module housing 11 includes a first housing 31 and a second housing 32, and a lower half of the module housing 11 is formed by the first housing 31. The upper half of the module housing 11 is formed by the two housings 32.

  The first housing 31 includes a lower plate 31a that forms the bottom surface of the module housing 11, a side plate 31b that extends substantially perpendicular to the lower plate 31a from an edge of the lower plate 31a, and a side plate 31b that extends from the outer surface of the lower plate 31a. And support legs 31c extending in the opposite direction. That is, the inner surface of the lower plate 31a is surrounded by the side plate 31b. Further, as shown in FIG. 3C, the support legs 31c are respectively provided at two corners of the lower plate outer surface. In other words, the support legs 31 c are provided at two corners on the bottom surface of the module housing 11, respectively. More specifically, one support leg 31c is provided near the intersection of the sides 11b and 11c of the module housing 11, and the other support leg 31c is provided near the intersection of the sides 11b and 11d.

  As shown in FIG. 4, the second housing 32 includes an upper plate 32a that forms the upper surface of the module housing 11, and a side plate 32b that extends substantially perpendicularly from the edge of the upper plate 32a to the upper plate 32a. . That is, the inner surface of the upper plate 32a is surrounded by the side plate 32b.

  The first casing 31 and the second casing 32 are combined so that the end surfaces of the side plates 31b and 32b are in contact with each other, and the first casing 31 and the second casing 32 are disposed between the opposing first casing 31 and second casing 32. A housing space 33 is formed. A module substrate 34 is accommodated in the accommodating space 33 of the module housing 11. The module substrate 34 is disposed in parallel with the lower plate 31 a of the first housing 31 and the upper plate 32 a of the second housing 32. The edge of the module substrate 34 is sandwiched between the opposing side plate end surfaces of the first housing 31 and the second housing 32. The module substrate 34 parallel to both the lower plate 31a and the upper plate 32a has a first surface facing the inner surface of the lower plate and a second surface facing the inner surface of the upper plate. That is, the module substrate 34 is accommodated between the lower plate 31 a and the upper plate 32 a of the module housing 11. In the following description, the first surface of the module substrate 34 is referred to as “back surface 34a” and the second surface is referred to as “front surface 34b”.

  A rectangular opening 35 is formed in the approximate center of the module substrate 34. In addition, a metal plate 36 is attached to the surface 34 b of the module substrate 34, and the opening 35 is closed by the metal plate 36. Inside the opening 35, a plurality of elements (light emitting elements 37 in the present embodiment) and a plurality of driver ICs 38 for driving the light emitting elements 37 are arranged. That is, the light emitting element 37 and the driver IC 38 are mounted on the metal plate 36 and are thermally connected to the metal plate 36. In other words, the light emitting element 37 and the driver IC 38 are mounted on one main surface of the metal plate 36. The other main surface of the metal plate is in contact with the inner surface of the upper plate of the second housing 32 through a heat conductive rubber 39 as a heat conductive member. That is, the light emitting element 37 and the driver IC 38 provided on the module substrate 34 are thermally connected to the module housing 11, particularly the upper plate 32 a of the second housing 32 through the metal plate 36 and the heat conductive rubber 39. ing.

  A plurality of electrode pads are formed around the opening 35 of the module substrate 34. Each electrode pad is connected to a predetermined driver IC 38 via a bonding wire 40. Each driver IC 38 is connected to a predetermined light emitting element 37 via a bonding wire 41. Here, the length of the bonding wires 40 and 41 is made as short as possible by making the depth of the opening 35 (the thickness of the module substrate 34) substantially the same as the height of the driver IC 38 and the light emitting element 37. is there.

  A second connector connected to the first connector provided on the mounting surface 3 a of the mother board 3 is provided on the back surface 34 a of the module substrate 34. In the following description, the first connector provided on the mother board 3 is referred to as “female connector 50”, and the second connector provided on the communication module 10 is referred to as “male connector 60”.

  As shown in FIG. 5, the male connector 60 includes a base portion 61 that is fixed to the module substrate 34 (FIG. 4) and a protruding portion 62 that extends from the base portion 61. The base portion 61 and the protruding portion 62 are integrally formed of synthetic resin. Positioning projections 61a are formed at both ends in the longitudinal direction of the base portion 61, and the end portion of the module substrate 34 (FIG. 4) is fitted between the opposing positioning projections 61a and 61a. The protruding portion 62 extends perpendicularly from the lower surface of the base portion 61 to the lower surface. As shown in FIG. 3C and FIG. 4, the protruding portion 62 of the male connector 60 protrudes outward from an opening provided in the lower plate 31 a of the first housing 31. As shown in FIG. 3C, the projecting portion 62 projecting outward from the lower plate 31a of the first housing 31 extends linearly along one side of the lower plate 31a. That is, the protruding portion 62 of the male connector 60 protrudes from the bottom surface of the module housing 11 and extends linearly along the side 11 a of the module housing 11.

  As shown in FIGS. 5 and 6A, a plurality of electrodes 63 are formed at regular intervals on the first side surface 62a of the protrusion 62 and the second side surface 62b facing the first side surface 62a. In other words, each of the first side surface 62a and the second side surface 62b is provided with an electrode array including a plurality of electrodes 63 formed at regular intervals. One end of each electrode 63 passes through the base portion 61 and protrudes from the upper surface of the base portion 61. The protruding end portion of each electrode 63 is connected to the driver IC 38 via a printed wiring (not shown) formed on the module substrate 34 shown in FIG.

  In order to avoid crosstalk, a part of the electrode 63 formed on the protrusion 62 is used as a ground terminal. That is, it is not possible to use all of the electrodes 63 formed on the projecting portion 62 as signal input / output terminals. Therefore, it is necessary to increase the total number of electrodes 63 in order to input and output a large number of signals while avoiding crosstalk. On the other hand, the area of the electrode formation surface (the first side surface 62a and the second side surface 62b) of the protrusion 62 is limited. Therefore, it is required to reduce the distance between the electrodes as much as possible. That is, it is required to form the electrodes 63 at a narrow pitch. In the present embodiment, the distance (P1) between the electrodes shown in FIG. 5 is 0.5 mm, and the distance (P2) between the electrode arrays shown in FIG. 6 (A) is 1.5 mm.

  As shown in FIG. 4, the male connector 60 having the above structure is fitted to the female connector 50 provided on the mounting surface 3 a of the mother board 3. As shown in FIGS. 5 and 6B, the female connector 50 is formed with a fitting groove 51 in an upper opening linearly along the longitudinal direction in which the protruding portion 62 of the male connector 60 can be inserted and removed. A plurality of electrodes 52 are provided inside the fitting groove 51. One end of each electrode 52 penetrates the bottom of the fitting groove 51 and protrudes out of the fitting groove 51. The protruding end portion of each electrode 52 is connected to the IC chip 2 via a printed wiring (not shown) formed on the mother board 3 shown in FIG.

  As shown in FIG. 4, the communication module 10 is mounted on the mother board 3 by fitting the male connector 60 to the female connector 50. Further, as shown in FIG. 6C, when the male connector 60 is fitted into the female connector 50, the electrodes 63 and 52 provided on the connectors 60 and 50 are brought into contact with each other and are electrically connected. Conducted to. As a result, the IC chip 2 shown in FIG. 1 and each communication module 10 are electrically connected, and signals can be transmitted and received.

  As shown in FIG. 4, when the male connector 60 is fitted into the female connector 50, the support legs 31 c extending from the bottom surface of the module housing 11 abut against the mounting surface 3 a of the motherboard 3. In other words, the length of the support leg 31 c is set to a length that abuts on the mounting surface 3 a of the mother board 3 when the male connector 60 is fitted to the female connector 50. That is, the communication module 10 mounted on the mother board 3 is supported by the male connector 60 and the support legs 31c that protrude from the bottom surface of the module housing 11 (the lower plate 31a of the first housing 31). In other words, the bottom surface of the module housing 11 includes a region where the male connector 60 protruding from the bottom surface is present and a region where the male connector 60 is not present. Therefore, when the communication module 10 is mounted on the mother board 3, that is, when the male connector 60 is fitted into the female connector 50, the area on the bottom surface of the module housing 11 where the male connector 60 does not exist. A gap 70 corresponding to the height of the two connectors 50 and 60 fitted to each other is formed between the mounting surface 3a of the mother board 3 and the mounting surface 3a. Therefore, the amount of heat released from the bottom surface of the module housing 11 is increased as compared with a configuration in which no gap exists between the bottom surface of the module housing 11 and the mounting surface 3a of the motherboard 3. Further, the cooling air can easily hit the bottom surface of the module housing 11. That is, the gap 70 is used as a space for heat dissipation or cooling.

  As shown in FIG. 3C, the male connector 60 is provided in the vicinity of the side 11a of the module housing 11, and the support legs 31c are provided in the vicinity of both ends of the side 11b facing the side 11a. Therefore, the communication module 10 is supported with good balance.

  Note that a fitting length and an effective fitting length exist between the female connector 50 and the male connector 60 connected as shown in FIG. 6C. The effective fitting length is a length included in the fitting length, and is a length within a range in which the electrical connection between the female connector 50 and the male connector 60 is maintained. That is, when the protruding portion 62 of the male connector 60 is inserted into the fitting groove 51 of the female connector 50, the connectors 50 and 60 are physically fitted at the initial stage, but are electrically conductive. Not done. Thereafter, when the protruding portion 62 of the male connector 60 is further inserted into the fitting groove 51 of the female connector 50, both the connectors 50 and 60 are electrically connected. Furthermore, since the effective fitting length has a certain length (for example, 0.5 mm to 1.0 mm), the male connector 60 is inserted into and removed from the female connector 50 within the range. In addition, the electrical continuity between the connectors 50 and 60 is maintained. In other words, the male connector 60 fitted to the female connector 50 can move to some extent in the vertical direction of the paper in FIG. 6 while maintaining electrical continuity with the female connector 50.

  Refer to FIG. 4 again. In addition to the male connector 60, an optical connector 80 as a connection portion is provided on the back surface 34 a of the module substrate 34. A part of the optical connector 80 protrudes outside the lower plate 31 a through an opening provided in the lower plate 31 a of the first housing 31. In other words, a part of the optical connector 80 is exposed outside the module housing 11. Therefore, in the following description, a part of the optical connector 80 exposed to the outside of the lower plate 31a is referred to as “exposed portion 80a”. That is, the exposed portion 80a of the optical connector 80 protrudes into a gap 70 formed between the bottom surface of the module housing 11 (the lower plate 31a of the first housing 31) and the mounting surface 3a of the motherboard 3. A plurality of communication cables (optical fibers 81) are connected to the exposed portion 80a. In other words, the optical fiber 81 connected to the module housing 11 via the optical connector 80 is drawn out around the module housing 11 through the gap 70.

  However, there is an embodiment in which all of the optical connectors are arranged inside the module housing. In such an embodiment, the optical fiber connected to the optical connector in the module housing is drawn out of the module housing from the side surface of the module housing (for example, the side plate 31b or the side plate 32b shown in FIG. 4). In this case, a boot is put on the drawn portion of the optical fiber to protect the optical fiber. On the other hand, the communication module 10 of the present embodiment in which the optical fiber 81 is connected to a part (exposed portion 80a) of the optical connector 80 protruding in the gap 70 formed between the motherboard 3 and the module housing 11. Then, the boot is not necessary, and the cost is reduced. Further, in the communication module 10 of this embodiment, the bending start point of the optical fiber 81 drawn from the module housing 11 is compared with the embodiment in which the optical fiber is drawn from the side surface of the module housing 11. Since it can arrange | position in the vicinity, the space required for the management of the optical fiber 81 becomes small.

  The optical connector 80 shown in FIG. 4 is incident on the end face of the optical fiber 81 while changing the traveling direction of the light emitted from the light emitting element 37. That is, the light emitting element 37 and the optical fiber 81 are optically coupled. Specifically, the optical connector 80 includes a lens array and a mirror, and the light emitted from the light emitting element 37 and incident on the lens array is reflected by the mirror and incident on the end face of the optical fiber 81. In the present embodiment, the traveling direction of light emitted downward from the paper surface from the light emitting element 37 shown in FIG. 4 is converted by 90 degrees by the optical connector 80 and is incident on the end face of the optical fiber 81.

  As described above, in this embodiment, the gap 70 is formed between the bottom surface of the module housing 11 and the mounting surface 3a of the mother board 3, and the gap 70 connects the optical fiber 81 as a communication cable. It is also used as a space.

  As shown in FIGS. 1 and 4, a heat sink 20 is disposed on the communication module 10. Specifically, as shown in FIG. 4, the heat absorbing plate 21 of the heat sink 20 is placed on the upper surface of the module housing 11 (the upper plate 32 a of the second housing 32) with a heat conducting rubber 90 serving as a heat conducting member interposed therebetween. It is piled up. In the present embodiment in which the module housing 11 and the optical fiber 81 are connected using a gap 70 formed between the bottom surface of the module housing 11 and the mounting surface 3 a of the motherboard 3, There are no irregularities on the outer surface of the upper plate of the second housing 32 forming the upper surface. Therefore, the entire outer surface of the upper surface of the second housing 32 is thermally connected to the heat absorbing plate 21 of the heat sink 20. Here, as described above, the light emitting element 37 and the driver IC 38 are thermally connected to the upper plate 32a of the second housing 32 through the metal plate 36 and the heat conductive rubber 39. That is, heat generated from the light emitting element 37 and the driver IC 38 is efficiently transmitted to the heat sink 20 through the upper plate 32a of the second housing 32.

  As shown in FIG. 1, the heat sink 20 placed on the communication module 10 is fixed to the mother board 3 by bolts 91 at four corners. Specifically, columnar spacers 92 are respectively disposed between the heat absorbing plate 21 of the heat sink 20 and the mother board 3. Female threads are respectively formed on the upper end surface and the lower end surface of each spacer 92, and a bolt 91 that passes through the heat absorbing plate 21 from the upper side to the lower side is coupled to the female screw formed on the upper end surface of the spacer 92. The bolt 93 penetrating the mother board 3 from below to above is coupled to a female screw formed on the lower end surface of the spacer 92.

  As shown in FIG. 2, each communication module 10 is disposed across two radiating fin groups in plan view. Specifically, the communication module 10a straddles the radiating fin group 22A and the radiating fin group 22B. The communication module 10b straddles the radiating fin group 22B and the radiating fin group 22C. The communication module 10c straddles the radiating fin group 22C and the radiating fin group 22D. The communication module 10d straddles the radiating fin group 22D and the radiating fin group 22E. That is, two radiating fin groups are assigned to one communication module 10.

  Further, a gap 23 is provided between adjacent radiating fin groups. Each gap 23 plays a role of enhancing the cooling effect by generating a turbulent flow between adjacent radiating fin groups.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, in the above embodiment, the communication module is provided with the male connector and the board is provided with the female connector. However, the communication module may be provided with the female connector and the board may be provided with the male connector. . The support legs that support the communication module may be integrally formed with the substrate. Moreover, you may arrange | position the member independent of the communication module and a board | substrate as a support leg between a communication module and a board | substrate.

  In the above embodiment, the light emitting element and the driver IC are mounted on the module substrate. That is, the communication module according to the above embodiment is for transmission. However, the light receiving element and the amplifier IC can be mounted on the module substrate. That is, a communication module for reception and a signal transmission device including the communication module are also included in the present invention. In addition, a light emitting element, a driver IC, a light receiving element, and an amplifier IC can be mounted on the module substrate. That is, a communication module for transmission / reception and a signal transmission device including the same are also included in the present invention. Furthermore, a semiconductor element (IC) can be mounted on the module substrate, and the semiconductor element and the metal wire can be connected via a connection portion. In this case, an electrical connector having a predetermined function (for example, a waveform shaping function) is used for the connection portion. That is, an active transmission module including an IC is also included in the present invention.

  Although the heat sink in the above embodiment is an air-cooled heat sink including a heat absorbing plate and a heat radiating fin, the heat sink can be replaced with a water-cooled heat sink including a heat absorbing plate and a refrigerant passage.

  The heat conductive rubber in the above embodiment can be replaced with a heat conductive sheet or grease having excellent heat conductivity.

  A plurality of communication modules can be arranged so as to surround four sides of the semiconductor element (IC chip) mounted on the substrate. In addition, a plurality of communication modules can be arranged along two or three sides of the semiconductor element (IC chip).

DESCRIPTION OF SYMBOLS 1 Signal transmission apparatus 2 IC chip 3 Motherboard 10 Communication module 11 Module housing | casing 20 Heat sink 31 1st housing | casing 31a Lower board 31b Side board 31c Support leg 32 2nd housing | casing 32a Upper board 32b Side board 34 Module board | substrate 34a Back surface (1st surface) )
34b Surface (second surface)
36 Metal Plate 37 Light Emitting Element 38 Driver IC
DESCRIPTION OF SYMBOLS 50 Female connector 60 Male connector 62 Projection part 62a 1st side surface 62b 2nd side surface 63 Electrode 70 Crevice 80 Optical connector 80a Exposed part 81 Optical fiber

Claims (9)

A communication module mounted on a substrate in a signal transmission device,
A module housing that includes a lower plate and an upper plate facing each other, and a module substrate is housed between the lower plate and the upper plate;
A second connector protruding from the lower plate and connected to the first connector provided on the substrate,
A communication module, wherein a gap is formed between the lower plate and the substrate of the module housing when the second connector is connected to the first connector. The communication module according to claim 1,
A communication module in which a communication cable is drawn from the lower plate of the module housing. The communication module according to claim 2, wherein
A light emitting device provided on the module substrate;
An optical fiber as the communication cable;
And a connection unit that changes the traveling direction of the light emitted from the light emitting element and enters the optical fiber. The communication module according to claim 2, wherein
A light receiving element provided on the module substrate;
An optical fiber as the communication cable;
And a connection unit that changes the traveling direction of the light emitted from the optical fiber and enters the light receiving element. The communication module according to claim 3 or 4,
A metal plate disposed between the upper plate of the module housing and the module substrate;
The communication module, wherein the light emitting element or the light receiving element is thermally connected to the module housing via the metal plate. In the communication module as described in any one of Claims 3-5,
The communication module, wherein the optical fiber is connected to a part of the connection portion protruding from the lower plate. In the communication module as described in any one of Claims 1-6,
The second connector has a protruding portion that protrudes from the lower plate and extends linearly along one side of the lower plate,
Each of the first side surface of the protruding portion and the second side surface facing the first side surface is provided with an electrode array composed of a plurality of electrodes formed at regular intervals along the longitudinal direction of the protruding portion. Communication module. A signal transmission device comprising a substrate on which a semiconductor element and a communication module are mounted,
The communication module includes:
A module housing that includes a lower plate and an upper plate facing each other, and a module substrate is housed between the lower plate and the upper plate;
A second connector protruding from the lower plate and connected to a first connector provided on the substrate;
A signal transmission device in which a gap is formed between the lower plate and the substrate of the module housing. The signal transmission device according to claim 8, wherein
A signal transmission device comprising a heat sink mounted on the upper plate of the module housing of the communication module.

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