JP5342986B2 - Optical module and cable with module - Google Patents

Description

  The present invention relates to an optical module used in optical communication technology, optical transmission technology, and optical information recording technology, and a cable with a module using the same.

In order to perform optical transmission between devices, for example, an optical module that converts electrical signals and optical signals is provided in each device, an optical fiber cable is connected to the optical module via an optical connector, and light is transmitted by the optical fiber cable. A method for transmitting and receiving signals can be used.
In this system, there is a problem in that signal deterioration occurs when dirt or foreign matter adheres to an optical connector that is attached to and detached from the optical module. Therefore, a cable with a module in which an optical module and an optical fiber cable are integrated has been proposed.
Some use a photoelectric composite cable with electric wires to enable power supply to the equipment.

As an optical fiber cable used for a cable with a module, there is one having a built-in strength member in order to increase strength against an external force such as a tensile force applied to the cable (see, for example, Patent Document 1). In this cable with a module, the strength member is fixed to the optical module.
As a structure for fixing the tensile member to the optical module, there is a structure for caulking and fixing to the housing of the optical module (for example, see Non-Patent Document 1).

JP 2004-325783 A

JIS Guidebook Electric II Optoelectronics C5983

In recent years, with an increase in information transmission amount and miniaturization in devices such as digital home appliances, there is a demand for an optical module that is small in size and capable of transmitting various types of signals.
Further, when a large amount of various data transmission is performed, or when an electrical connector that uses a large number of pins is opticalized, a large number of optical fibers may be required.
However, the above-described optical module is difficult to cope with downsizing because a strong housing that can bear an external force applied to a cable or the like is required.
Further, since the structure for fixing the tension member is complicated, it is not appropriate when the number of optical fibers is large. Moreover, since the internal structure is complicated, it is difficult to reduce the cost.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an optical module and a cable with a module that are excellent in durability against external force and can be reduced in size and cost.

The invention according to claim 1 of the present invention is an optical module assembled at an end portion of an optical fiber cable having an optical fiber and a tensile body along the optical fiber, and the optical fiber drawn from the optical fiber cable is A circuit board provided with a photoelectric conversion part connected via an optical coupling part, a metal connection cylinder fixed to the circuit board, and the tensile body drawn from the optical fiber cable are connected to the connection cylinder. An optical module including a caulking ring that is sandwiched between and fixed to an outer surface of the body, and wherein the optical fiber is inserted through the connection cylinder and connected to the circuit board.
According to a second aspect of the present invention, in the first aspect of the present invention, in the first aspect, a fitting convex portion is formed on the connection cylinder, and a fitted portion to which the fitting convex portion can be fitted is formed on the circuit board. The connecting cylinder is an optical module that is fixed to the circuit board in a state where the fitting convex portion is fitted to the fitted portion.
According to a third aspect of the present invention, in the first or second aspect, a locking step portion is formed at an intermediate position in the length direction of the fitting convex portion, and the locking step portion is the fitting portion. When the dimension of the part is larger than a predetermined value, it is locked to the fitted part, and when the dimension of the fitted part is less than a predetermined value, it is not locked to the fitted part. It is an optical module.
According to a fourth aspect of the present invention, in any one of the first to third aspects, a partition that divides the connection cylinder is formed in the connection cylinder, and the partition is one of the circuit boards. This is an optical module formed so that the wiring on the other surface side and the wiring on the other surface side can be partitioned.
The invention according to claim 5 of the present invention is the optical fiber cable according to any one of claims 1 to 4, wherein the optical fiber cable is a photoelectric composite cable including an electric wire along the optical fiber. An optical module connected to the circuit board.
The invention according to claim 6 of the present invention is a cable with a module in which the optical module according to any one of claims 1 to 5 is assembled to at least one end of the optical fiber cable.

According to the present invention, an external force such as a tensile force or a bending force with respect to the optical fiber cable is transmitted to the circuit board via the tensile body, the connecting cylinder, and the caulking, so that the external force does not reach the optical fiber. It is possible to prevent the optical fiber, the optical coupling part, etc. from being damaged or deformed.
Moreover, since the structure for fixing the strength member is simple, the optical module can be reduced in size.
Further, since the caulking ring is fixed to the connecting cylinder, it is not necessary to give the housing mechanical strength that can cope with the caulking fixation, and the degree of freedom in design can be increased, and downsizing and cost reduction can be realized.

It is a partial cross section figure which shows the optical module which concerns on the 1st example of this invention. It is a perspective view which shows the principal part of an optical module. It is a side view which shows the principal part of an optical module. It is a schematic block diagram which shows the principal part of a cable with a module. It is a figure which shows a connection cylinder, Comprising: (a) is a front view, (b) is a sectional side view, (c) is a bottom view. It is explanatory drawing which shows the assembly procedure of an optical module. It is sectional drawing which shows the principal part of an optical module. It is a perspective view which shows the other example of a connection cylinder. It is a sectional side view which shows the principal part of the connection cylinder shown to a previous figure. It is a sectional side view which shows the installation state of a connection cylinder. It is a sectional side view which shows the other installation state of a connection cylinder. It is a sectional side view which shows the other installation state of a connection cylinder. It is a perspective view which shows the other example of a connection cylinder. It is a partial cross section perspective view which shows the other example of a connection cylinder. It is a partial cross section perspective view which shows the other example of a connection cylinder. It is sectional drawing which shows the other example of a connection cylinder. It is a partial cross section figure which shows the optical module which concerns on the 2nd example of this invention.

Hereinafter, based on an embodiment, the present invention will be described with reference to the drawings.
1 to 4 show a cable with a module using a photoelectric conversion module 1 which is an optical module according to a first example of the present invention.
As shown in FIGS. 1 and 4, this module-equipped cable has a photoelectric conversion module 1 (optical module) at the end of an optical fiber cable 4 having an optical fiber 2 (optical transmission line) and a strength member 3. It is assembled.

As shown in FIG. 1, the photoelectric conversion module 1 includes a circuit board 8, a metal connection cylinder 15 fixed to the circuit board 8, and a tensile body 3 sandwiched between outer surfaces of the connection cylinder 15. A crimping ring 16 to be fixed and an electrical connector 5 (connector portion) connected to the circuit board 8 are provided.
The circuit board 8, the connecting cylinder 15, and the caulking ring 16 are accommodated in the housing 11 together with the optical fiber 2 drawn from the optical fiber cable 4 and the distal end portion of the strength member 3.
The electrical connector 5 is provided at the front end of the housing 11 so as to protrude from the housing 11 and is configured to be connectable to other devices.
In the following description, the left side in FIG. 1 may be referred to as the front, and the right side may be referred to as the rear. The front-rear direction coincides with the length direction at the end of the optical fiber cable 4, and this direction is also the length direction of the photoelectric conversion module 1.

  As the circuit board 8, for example, various general insulating boards such as a glass epoxy board and a ceramic board can be used. Predetermined circuit wiring is formed on the surfaces 8 a and 8 b of the circuit board 8.

The strength member 3 is provided along the optical fiber 2, and an end portion thereof is introduced into the housing 11 of the photoelectric conversion module 1.
As the strength member 3, an aramid fiber is preferably used, but a glass fiber, a carbon fiber, or the like can also be used.

As shown in FIG. 5, the connecting cylinder 15 is a cylinder made of a metal such as brass or stainless steel, and has a substantially cylindrical cylinder base 17 and an axial direction of the cylinder base 17 from one end thereof. And a substantially semi-cylindrical fixing portion 18 extending.
On both side edge portions 18a and 18b of the fixed portion 18, a fitting convex portion 19 is formed. The fitting convex portion 19 positions and fixes the connecting cylinder 15 to the circuit board 8, and extends linearly from the side edge portions 18 a and 18 b in the tangential direction of the fixing portion 18.
Since the fitting convex portion 19 extends in the tangential direction of the substantially semi-cylindrical fixing portion 18, the fitting convex portion 19 is substantially perpendicular to the circuit board 8 when fixed to the circuit board 8.

One or a plurality of fitting protrusions 19 can be formed on each side edge 18a, 18b. In the illustrated example, two fitting projections 19a and 19a are formed on one side edge 18a, and two fitting projections 19b and 19b are formed on the other side edge 18b.
The fitting convex portions 19a and 19a are formed at intervals in the front-rear direction (the axial direction of the connecting cylinder 15). Similarly, the fitting convex portions 19b and 19b are also formed at intervals in the front-rear direction.
The fitting convex part 19a formed in one side edge part 18a and the fitting convex part 19b formed in the other side edge part 18b differ in the position of the front-back direction (the axial direction of the connection cylinder 15). Preferably formed. Thereby, when fixing the connection cylinder 15 with respect to the circuit board 8, it becomes easy to recognize the error of an installation position, and the misoperation at the time of an assembly can be prevented.

A passage notch 18 c through which the optical fiber 2 can pass is formed at the front end edge of the fixed portion 18. The shape of the passage notch 18 c is not limited as long as it is a recess through which the optical fiber 2 can pass. The passage notch 18 c in the illustrated example is substantially V-shaped formed at the front end edge of the fixed portion 18.
For this reason, even when it is necessary to wire the optical fiber 2 at a position away from the circuit board 8 in the thickness direction of the board 8 (upward in the illustrated example), the optical fiber 2 is excessively bent by the fixing portion 18. Is not added, and adverse effects on the optical characteristics can be prevented.
The cylindrical base portion 17 can increase the fixing strength of the strength member 3 by forming the uneven portion 17a on the outer surface of the portion where the caulking ring 16 is mounted (see FIG. 5C). The uneven part 17a in the illustrated example is a mesh-like groove part.

As shown in FIG. 6, the circuit board 8 has a fitting hole 8 c that is a fitted portion.
The fitting hole 8c is formed in accordance with the number and position of the fitting convex portions 19a, 19b of the connecting cylinder 15. In the example of illustration, the four fitting holes 8c are formed according to the total four fitting convex parts 19. FIG.
In the present invention, the portion to be fitted is not limited to the fitting hole, but may be a concave portion into which the fitting convex portion can be fitted.

The caulking ring 16 is a cylinder having an inner diameter slightly larger than the outer diameter of the connection cylinder 15 and is made of a metal such as an aluminum alloy.
The caulking ring 16 can be fixed by sandwiching the strength member 3 by deforming at least a part thereof in the diameter-reducing direction with the strength member 3 sandwiched between the outer surface of the connecting cylinder 15.

As shown in FIG. 1, a light emitting / receiving element 9 (photoelectric conversion unit) to which the optical fiber 2 is connected and a control semiconductor 10 are provided on one surface 8 a of the circuit board 8.
Examples of the optical fiber 2 include optical fibers such as a silica-based optical fiber and a plastic optical fiber (POF).
The optical fiber 2 is wired along one surface 8 a of the circuit board 8 and connected to the light emitting / receiving element 9.

As shown in FIG. 7, the light emitting / receiving element 9 has a light emitting / receiving unit 9a as a part for emitting or entering an optical signal. The illustrated light emitting / receiving unit 9 a is provided on the upper surface 9 c of the light emitting / receiving element 9.
When the light emitting / receiving element 9 is a light receiving element, the light receiving / emitting part 9a is a light receiving part. When the light emitting / receiving element 9 is a light emitting element, the light emitting / receiving part 9a is a light emitting part.
Examples of the light emitting element include a light emitting diode (LED), a laser diode (LD), and a surface emitting laser (VCSEL). A photodiode (PD) etc. are mentioned as a light receiving element.

The light emitting / receiving element 9 is electrically connected to the photoelectric conversion unit electrode 6 formed on the one surface 8 a of the circuit board 8.
In the illustrated example, the light emitting / receiving element 9 is electrically connected to one photoelectric conversion unit electrode 6 via a wiring 14 connected to the upper surface 9c (front surface). The lower surface 9d (back surface) of the light emitting / receiving element 9 is electrically connected to the other photoelectric conversion unit electrode 6 by a conductive adhesive (not shown).
As the wiring 14, for example, a gold (Au) wire, an aluminum (Al) wire, a copper (Cu) wire, or the like can be used.

  The light emitting / receiving element 9 is arranged such that the optical axis 9b intersects the optical axis 2b of the optical fiber 2 (particularly the optical axis 2b in the vicinity of the end 2a) at a predetermined angle θ (for example, 0 <θ <180 °). ing. The light receiving / emitting element 9 and the optical fiber 2 are preferably arranged such that their optical axes 9b, 2b are perpendicular (or substantially perpendicular) to each other.

The light emitting / receiving element 9 is connected to the optical fiber 2 via the optical coupling portion 13.
The optical coupling unit 13 is made of a resin that is transparent to transmitted light. The resin constituting the optical coupling unit 13 is in close contact with at least a part of the light emitting / receiving unit 9a of the light emitting / receiving element 9 and at least a part of the end 2a of the optical fiber 2.
The transparent resin here refers to a material capable of transmitting light transmitted between the light emitting / receiving element 9 and the optical fiber 2 and is not necessarily limited to a colorless and transparent color tone under visible light. is not.
As the transparent resin, for example, a UV curable resin or a thermosetting resin can be used. Specific examples of the transparent resin include acrylic resins, epoxy resins, and silicone resins.
The optical fiber 2 is connected to the circuit board 8 via the optical coupling portion 13 and the light emitting / receiving element 9.

As shown in FIG. 1 and FIG. 7, the control semiconductor 10 can perform level adjustment, various conversions, and the like as necessary on the electric signal input through the circuit wiring of the circuit board 8. The control semiconductor 10 may be provided on one surface 8a of the circuit board 8, or may be provided on the other surface 8b.
In addition, when the function of the control semiconductor 10 is provided other than the circuit board 8, the control semiconductor 10 may be omitted without being provided in the circuit board 8.

When the light emitting / receiving element 9 is a light emitting element, the electric signal input from the electric connector 5 is input to the control semiconductor 10 through the circuit wiring of the circuit board 8 and is subjected to level adjustment as necessary. After that, the light is input from the photoelectric conversion unit electrode 6 to the light receiving and emitting element 9 through the circuit wiring.
In the light emitting / receiving element 9, the electrical signal is converted into an optical signal, and the optical signal emitted from the light emitting / receiving unit 9 a is incident on the optical coupling unit 13, reflected by the interface (outer surface 13 a) and incident on the optical fiber 2.

When the light receiving / emitting element 9 is a light receiving element, the light incident on the optical coupling unit 13 from the optical fiber 2 is reflected by the interface (outer surface 13a) and enters the light receiving / emitting unit 9a of the light receiving / emitting element 9.
In the light emitting / receiving element 9, the optical signal is converted into an electric signal, and this electric signal is input to the photoelectric conversion unit electrode 6, input to the control semiconductor 10 through the circuit wiring of the circuit board 8, and necessary in the control semiconductor 10. After level adjustment or the like is performed accordingly, it is sent to the electrical connector 5 via circuit wiring.

Next, a method for assembling the photoelectric conversion module 1 at the end of the optical fiber cable 4 will be described.
As shown in FIG. 6, the fitting convex part 19 of the connection cylinder 15 is inserted in the fitting hole 8c. In the example of illustration, the fitting convex part 19 is inserted in the fitting hole 8c from one surface 8a. The fitting convex portion 19 can be inserted into the fitting hole 8c up to its base end portion.
The fitting protrusion 19 is preferably fixed to the circuit board 8 by soldering or the like on the other surface 8b.

The tensile body 3 pulled out from the end of the optical fiber cable 4 is disposed between the outer surface of the connecting cylinder 15 and the caulking ring 16, and the caulking ring 16 is deformed in the diameter reducing direction so that the tensile body 3 is sandwiched and fixed. To do.
Thus, the optical fiber cable 4 is connected to the circuit board 8 via the connection cylinder 15 and the caulking ring 16.

The optical fiber 2 drawn out from the end of the optical fiber cable 4 is inserted into the connection cylinder 15 and connected to the light emitting / receiving element 9 through the optical coupling portion 13 on the one surface 8a side of the circuit board 8.
In the example shown in FIG. 1, the optical fiber 2 is connected only to the one surface 8a side of the circuit board 8, but a part of the optical fiber 2 can also be connected to the other surface 8b side (see FIG. 1). 3).

Since the photoelectric conversion module 1 includes the connection cylinder 15 fixed to the circuit board 8 and the caulking ring 16 that sandwiches the strength member 3 between the connection cylinder 15, the photoelectric conversion module 1 has a tensile force on the optical fiber cable 4. An external force such as a bending force is transmitted to the circuit board 8 through the tensile body 3, the connecting cylinder 15 and the caulking ring 16.
For this reason, this external force does not reach the optical fiber 2, and damage to the optical fiber 2, damage to the optical coupling portion 13, deformation, and the like can be prevented.

Moreover, since the structure for fixing the strength member 3 is simple, the photoelectric conversion module 1 can be downsized.
Further, since the caulking ring 16 is fixed to the connecting cylinder 15, unlike the structure in which the caulking ring is fixed to the housing, it is not necessary to give the housing 11 mechanical strength that can cope with the caulking fixing. For this reason, the freedom degree of design is raised and size reduction and price reduction are realizable.

FIG. 8 and FIG. 9 show another example of the connection cylinder 15. In this connection cylinder 15, the fitting convex portion 20 extends from the base end side to the distal end side, and the first portion 21 and the first portion 21. The second portion 22 is narrower than the portion 21 and the third portion 23 is narrower than the second portion 22.
The first portion 21 has a substantially constant width in the extending direction. Along with the formation of the second portion 22, a locking step portion 21 a is formed at the lower end (tip). Similarly, the second portion 22 also has a substantially constant width in the extending direction. Along with the formation of the third portion 23, a locking step portion 22a is formed at the lower end (tip) thereof. The third portion 23 also has a substantially constant width.
In the illustrated example, since the first portion 21 to the third portion 23 are formed with the center positions in the width direction being coincident, the locking step portions 21a and 22a are respectively formed at the lower ends of both side edges of the portions 21 and 22. The

As shown in FIGS. 10 to 12, the configuration of the fitting convex portion 20 enables adjustment of the height position of the main body portion (cylinder base portion 17, fixing portion 18, etc.) of the connecting cylinder 15 with respect to the circuit board 8. .
That is, as shown in FIG. 10, when the width dimension of the fitting hole 8c is larger than the first predetermined value, the fitting convex portion 20 is inserted into the fitting hole 8c up to the proximal end portion.
On the other hand, as shown in FIG. 11, when the fitting hole 8c has a width dimension corresponding to the second portion 22 (when the width dimension of the fitting hole 8c is equal to or smaller than the first predetermined value), Since the stop portion 21a is locked to the opening end of the fitting hole 8c, the first portion 21 is not inserted into the fitting hole 8c. For this reason, the main body portion of the connection cylinder 15 is disposed at a position away from the circuit board 8.
Similarly, as shown in FIG. 12, when the fitting hole 8c has a width dimension corresponding to the third portion 23 (when the width dimension of the fitting hole 8c is equal to or smaller than the second predetermined value), The step portion 22a is locked to the opening end of the fitting hole 8c, and the first portion 21 and the second portion 22 are not inserted into the fitting hole 8c. Therefore, the main body portion is disposed at a position further away from the circuit board 8.

Thus, the height position of the connection cylinder 15 with respect to the circuit board 8 can be adjusted by setting the width dimension of the fitting hole 8c.
For this reason, when it is necessary to wire the optical fiber 2 at a relatively high position with respect to the circuit board 8 to which the connection cylinder 15 is fixed (when a submount is used to reduce thermal stress, a plurality of circuits are used. In the case of using a substrate, the circuit board 8 is required to be installed at a low position in the housing 11), and the optical fiber 2 is not excessively bent by the connecting cylinder 15. Can be prevented from being adversely affected.

In the example shown in FIGS. 8 and 9, the first portion 21 to the third portion 23 are formed with the center positions in the width direction matched, but as shown in FIG. 13, the second portion 22 and the third portion The width direction position of one side edge 22b, 23b of 23 may be formed so as to coincide with the width direction position of one side edge 21b of the first portion 21.
Also in this case, the height position of the connecting cylinder 15 described above can be adjusted.

FIGS. 14 to 16 show still another example of the connecting cylinder 15. In the connecting cylinders 15 </ b> A and 15 </ b> B shown here, a partition wall 25 that divides the inside vertically is formed in the cylinder base 17. Yes.
The partition wall 25 divides the wiring on the one surface 8 a side and the wiring on the other surface 8 b side of the circuit board 8, and the circuit board 8 in a state where the connecting cylinders 15 A and 15 B are fixed to the circuit board 8. It is preferable to form so that it may follow.

14 has a semi-tubular first portion 26, a semi-tubular second portion 27, and a partition wall 25 provided therebetween.
The partition wall 25 is provided by connecting one side edge 26a of the first portion 26 and the other side edge 27b of the second portion 27, and the connecting cylinder 15A has a substantially S-shaped cross section as a whole. Have
15 includes a main tube portion 28 and a partition wall 25 extending in the diameter direction from one side edge 28a of the main tube portion 28 toward the inside thereof. It has a substantially e-shaped structure.
The connecting cylinders 15A and 15B can be formed by bending a metal plate.

As shown in FIG. 16, in the connecting cylinders 15 </ b> A and 15 </ b> B, the partition wall 25 can partition the wiring on the one surface 8 a side and the wiring on the other surface 8 b side of the circuit board 8.
For example, the optical fiber 2 connected to one surface 8a of the circuit board 8 is arranged in the space 17b on one side of the partition wall 25, and the optical fiber 2 connected to the other surface 8b is arranged in the space 17c on the other side. Can prevent confusion.
When using a photoelectric composite cable described later, the electric wire and the optical fiber are separated from each other by the partition wall 25, and a reduction in transmission loss due to the entanglement of the electric wire and the optical fiber can be prevented.
Further, the partition wall 25 can be used to partition the transmission wiring and the reception wiring, and can also be used to partition the wiring for each channel.

FIG. 17 shows an optical module according to a second example of the present invention, in which the photoelectric conversion module 1 in the case of using an optical / electrical composite cable 4 provided with an optical fiber 2 and an electric wire 12 along the optical fiber 2 is shown. It is shown.
As the electric wire 12, a general-purpose product in which a resin coating 12b is provided on the outer periphery of a metal conductor 12a made of, for example, copper can be used.
The electric wire 12 is connected to an electric wire connecting electrode 7 provided on the other surface 8 b of the circuit board 8, and is electrically connected to the electric connector 5 through the circuit wiring of the circuit board 8.
For this reason, the device to which the electrical connector 5 is connected can supply power and transmit / receive electrical signals through the electrical connector 5.
It is also possible to supply electric power from the electric wire 12 to the control semiconductor 10 to operate it.

Also in this example, an external force such as a tensile force or a bending force with respect to the photoelectric composite cable 4 is transmitted to the circuit board 8 through the tensile body 3, the connecting cylinder 15, and the caulking ring 16, and thus the external force is transmitted to the optical fiber 2. In addition, the optical fiber 2, the optical coupling portion 13, the electric wire 12, and the like can be prevented from being damaged or deformed.
Moreover, since the structure for fixing the strength member 3 is simple, the photoelectric conversion module 1 can be downsized.
Further, since the caulking ring 16 is fixed to the connecting cylinder 15, it is not necessary to give the housing 11 mechanical strength that can cope with the caulking fixing, and the degree of freedom in design can be increased, and downsizing and cost reduction can be realized. .

In the present invention, a configuration in which the optical module is provided only at one end of the optical fiber cable is also possible.
Further, in the illustrated example, the fitting convex portion 19 formed on the connecting cylinder 15 is configured to fit into the fitting hole 8c (fitted portion) of the circuit board 8, but conversely formed on the circuit board. A configuration in which the fitted convex portion is fitted to the fitted portion of the connecting cylinder is also possible.

DESCRIPTION OF SYMBOLS 1 ... Photoelectric conversion module (optical module), 2 ... Optical fiber, 3 ... Strength body, 4 ... Optical fiber cable, photoelectric composite cable, 8 ... Circuit board, 8a ... One surface, 8b ... the other surface, 8c ... fitting hole (fitted part), 9 ... light emitting / receiving element (photoelectric conversion part), 12 ... electric wire, 13 ... light Coupling part, 15, 15A, 15B ... connecting cylinder, 16 ... caulking, 19, 20 ... fitting convex part, 21a, 22a ... locking step part, 25 ... partition.

Claims (6)

An optical module assembled at an end of an optical fiber cable having an optical fiber and a tensile body along the optical fiber,
A circuit board provided with a photoelectric conversion unit to which an optical fiber drawn from the optical fiber cable is connected via an optical coupling unit;
A metal connection cylinder fixed to the circuit board;
A caulking ring that clamps and fixes the tensile body drawn from the optical fiber cable between the outer surface of the connection cylinder, and
The optical module, wherein the optical fiber is inserted through the connection cylinder and connected to the circuit board. A fitting convex portion is formed on the connecting cylinder,
The circuit board is formed with a fitted portion to which the fitting convex portion can be fitted,
The optical module according to claim 1, wherein the connection cylinder is fixed to the circuit board in a state where the fitting convex portion is fitted to the fitting portion. A locking step portion is formed at the intermediate position in the length direction of the fitting convex portion,
The locking step portion is locked to the fitted portion when the dimension of the fitted portion is larger than a predetermined value, and the fitted step when the dimension of the fitted portion is equal to or less than a predetermined value. The optical module according to claim 1, wherein the optical module is formed so as not to be locked to the joint portion. A partition wall is formed inside the connection cylinder to partition the inside,
The said partition is formed so that the wiring of the one surface side of a circuit board and the wiring of the other surface side can be divided, The any one of Claims 1-3 characterized by the above-mentioned. The optical module as described. The optical fiber cable is a photoelectric composite cable provided with an electric wire along the optical fiber,
The optical module according to claim 1, wherein the electric wire is connected to the circuit board.   A cable with a module, wherein the optical module according to any one of claims 1 to 5 is assembled to at least one end of the optical fiber cable.

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