JP2006135255A - Light transmitting/receiving system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make the communication of a component, such as casing, possible even when there is a difference in size between a transmission submodule and a receiving submodule because of a difference between a transmitting rate and a receiving rate. <P>SOLUTION: A cutout 50 of rigid substrate 32 of the light transmitting/receiving module 12A is shorter than a cutout 51 formed on the rigid substrate 33 of the light transmitting/receiving module 12B in the size in the transmitting/receiving direction of a light signal. Whereby, a difference in length is absorbed between a shield component 70 which connects the light emitting surface of a light transmitting submodule 22 to a connection surface of an optical fiber 82, and a shield component 71 which connects a light receiving surface of a light receiving submodule 24 to a connection surface of the optical fiber 82, and the whole sizes of the light transmitting/receiving module 12A and light transmitting/receiving module 12B can be set the same. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an optical transmission / reception system.

  In recent years, an optical signal transmission device that transmits data using an optical signal using an optical fiber has been used (for example, see Patent Document 1). Patent Document 1 discloses an optical signal transmission / reception module for transmitting / receiving an optical signal. This optical signal transmission / reception module has the same transmission speed and reception speed, and a module in which the transmission module and the reception module are integrated can be used.

  On the other hand, when the transmission speed and the reception speed of the optical signal for transmitting data are different, it is necessary to configure the transmission module and the reception module separately. At this time, the shape of the transmission submodule mounted on the transmission module may be different from the shape of the reception submodule mounted on the reception module. In particular, when transmitting a large amount of data using a large-diameter optical fiber, a lens for concentrating the transmitted optical signal to the photodiode is required on the receiving submodule side, so it is mounted on the transmission module. The size is larger (longer) than the transmission submodule.

As described above, when the transmission submodule and the reception submodule have different sizes, the size differs between the casing in which the transmission submodule is mounted and the casing in which the reception submodule is mounted. As a result, parts such as a case cannot be shared, and it becomes necessary to create two types of cases, leading to an increase in cost.
JP 07-244230 A

  In order to solve these problems, the present invention makes it possible to share components such as a housing even when the transmission submodule and the reception submodule are different in size because the transmission speed and the reception speed are different. An optical transmission / reception system is provided.

  In order to achieve the above object, the invention according to claim 1 is provided with a transmission submodule that extends along the traveling direction of an optical signal, converts an electrical signal into an optical signal, and transmits the optical signal, and the transmission submodule is mounted. The first module board, a first control board that generates an electrical signal to be transmitted to the first module board, a first flexible wiring board that connects the first module board and the first control board, and A first transmission / reception module having a first shield member for holding a first module substrate and connecting a light emitting surface of the transmission submodule to a connection surface with an optical fiber, and extending along a traveling direction of an optical signal A reception sub-module that is longer than the transmission sub-module and that receives an optical signal, converts it into an electrical signal and outputs it, and a second module on which the reception sub-module is mounted A board, a second control board for processing electrical signals from the second module board, a second flexible wiring board for connecting the second module board and the second control board, and holding the second module board And a second transmission / reception module comprising: a second transmission / reception module having a second shield member connecting the light receiving surface of the reception sub-module to a connection surface with the optical fiber, wherein the first shield member and the second shield are provided. The difference in length of the members is absorbed by making the first flexible wiring board longer than the second flexible wiring board.

  According to the first aspect of the present invention, the transmission sub-module and the reception sub-module have different optical systems arranged therein, so that the length of the optical signal in the reception direction is longer than the length of the optical signal in the transmission direction. Have been long.

  Therefore, the receiving submodule is mounted with the first flexible wiring board that connects the first module board on which the transmission submodule is mounted and the first control board that generates an electrical signal to be transmitted to the first module board. The second module board and the second control board that processes the electrical signal from the second module board are made longer than the second flexible wiring board to connect the transmission submodule to the optical fiber connection surface. A difference in length between the first shield member connecting the light emitting surface and the second shield member connecting the light receiving surface of the receiving submodule to the connection surface of the optical fiber is absorbed.

  As a result, the overall size of the first transmission / reception module and the second transmission / reception module can be made the same. In other words, the casing of the first transmission / reception module and the casing of the second transmission / reception module can be made the same shape, so that the mold for creating the casing becomes common, and the manufacturing cost of the casing can be reduced. it can.

  According to a second aspect of the present invention, there is provided a transmission submodule that extends along a traveling direction of an optical signal, converts an electrical signal into an optical signal and transmits the optical signal, and a first module board on which the transmission submodule is mounted. A first control board for generating an electrical signal to be transmitted to the first module board; a first flexible wiring board for connecting the first module board and the first control board; and holding the first module board. A first transmission / reception module having a first shield member for connecting a light emitting surface of the transmission submodule to a connection surface with an optical fiber, and extending along a traveling direction of an optical signal, than the transmission submodule A long receiving sub-module that receives an optical signal, converts it into an electrical signal and outputs it, a second module board on which the receiving sub-module is mounted, and the second module A second control board for processing electrical signals from the board, a second flexible wiring board for connecting the second module board and the second control board, and holding the second module board and connecting to an optical fiber A second transmission / reception module comprising: a second transmission / reception module having a second shield member connecting the light receiving surface of the reception submodule to the surface; and a difference in length between the first shield member and the second shield member. The length of the first control board in the transmission / reception direction of the optical signal is absorbed by making it longer than the length of the second control board in the transmission / reception direction of the optical signal.

  According to the second aspect of the present invention, the first control board connected to the first module board on which the transmission submodule is mounted is connected to the second control board to which the second module board on which the reception module is mounted. The first shield member that connects the light emitting surface of the transmission submodule to the connection surface of the optical fiber by increasing the length in the transmission / reception direction of the optical signal, and the light receiving surface of the reception submodule to the connection surface of the optical fiber Absorbs the difference in length of the second shield member connecting the two.

  Thereby, it becomes possible to make the whole size of a 1st transmission / reception module and a 2nd transmission / reception module the same, and the housing | casing of a 1st transmission / reception module and the housing | casing of a 2nd transmission / reception module can be made into the same shape.

  The invention according to claim 3 is characterized in that the first transmission / reception module and the second transmission / reception module are mounted in a casing having the same shape.

  According to the invention described in claim 3, it is necessary to create two types of casings by making the casing on which the first transmission / reception module is mounted and the casing on which the second transmission / reception module is mounted the same shape. Therefore, the mold for creating the casing is common, and the manufacturing cost of the casing can be suppressed.

  Since the present invention has the above-described configuration, parts such as a housing can be shared even when the transmission submodule and the reception submodule are different in size because the transmission speed and the reception speed are different.

  The optical transmission / reception system 10 according to the first embodiment of the present invention will be described below with reference to the drawings.

(overall structure)
First, the overall configuration of the optical transmission / reception system 10 of the present embodiment will be briefly described with reference to FIG.

  The optical transmission / reception system 10 is a system for displaying a video signal from the host 16 on the monitor 14. The optical transmission / reception system 10 includes an optical transmission / reception module 12A that transmits a high-speed optical signal and receives a low-speed optical signal, an optical transmission / reception module 12B that receives a high-speed optical signal and transmits a low-speed optical signal, and these optical transmission / reception modules 12A. And an optical fiber cable 18 for high-speed optical signals, and an optical fiber cable 19 for low-speed optical signals.

  The video signal output from the host 16 is converted into an optical signal by the optical transmission / reception module 12A connected to the host 16, and transmitted to the optical transmission / reception module 12B connected to the monitor 14 via the optical fiber cable 18. The optical transmission / reception module 12B converts the optical signal transmitted from the optical transmission / reception module 12A into a digital electric signal, and displays an image on the monitor 14.

  The optical transmission / reception system 10 includes a shield cable 21 that is a video signal cable and an electric cable 17 that transmits a control signal and the like to connect the host 16 and the optical transmission / reception module 12A. In order to connect the optical transmission / reception module 12B, a shielded cable 34 and an electric cable 36 for transmitting a control signal and the like are provided.

(Optical transceiver module)
Since the optical transmission / reception module 12A and the optical transmission / reception module 12B have substantially the same configuration, the optical transmission / reception module 12A will be described as an example here.

  As shown in FIG. 2, the optical transceiver module 12 </ b> A includes an optical signal transmitter 26, an optical signal receiver 28, and a digital signal controller 30. The optical signal transmission unit 26 includes an optical transmission submodule 22 (see FIG. 5) and a rigid board 27 on which the optical transmission submodule 22 is mounted. The optical signal receiving unit 28 includes an optical receiving submodule 24 and a rigid substrate 29 on which the optical receiving submodule 24 is mounted.

  As illustrated in FIGS. 2 and 3, the optical transmission / reception module 12 </ b> A includes a box-shaped housing 42 and a lid 44 that closes an opening of the housing 42. A rigid substrate 32 constituting the digital signal control unit 30 is installed at the bottom of the housing 42.

  The rigid board 32 is disposed in the housing 42 with the mounting surface on which various electronic components are mounted facing upward. A plurality of ICs are mounted on this mounting surface.

  As shown in FIG. 3, a convex portion 60 is formed at a position corresponding to the IC 140 on the surface (back surface) facing the housing 42 of the lid portion 44 with the housing 42 covered with the lid portion 44. Yes. In the present embodiment, the convex portion 60 is formed with a size that covers the plurality of ICs 140 mounted on the rigid substrate 32.

  In addition, a heat dissipation sheet 142 is placed on the IC 140. The heat radiation sheet 142 is sandwiched between the convex portion 60 and the IC 140 when the casing 42 is covered with the lid portion 44, and is fixed by pressing.

  In the present embodiment, the thickness of the heat dissipation sheet 142 is 1.0 mm to 2.5 mm. Thereby, the surface temperature of IC140 can be reduced about 4 degreeC. Note that the thickness of the heat dissipation sheet 142 is not necessarily 1.0 mm to 2.5 mm.

  As shown in FIG. 4, when the heights of the plurality of ICs 140 mounted on the rigid substrate 32 are not uniform, the heat radiation grease 144 is applied on the ICs 140 having a low height. As a result, when the casing 42 is covered with the lid portion 44, variations in the heights of the plurality of ICs 140 can be absorbed by the heat dissipation grease 144, and all the ICs 140 serving as heat generation sources can be brought into contact with the heat dissipation sheet 142. .

  On the upper surface of the lid portion 44, heat radiation fins 146 are integrally formed corresponding to the positions where the convex portions 60 are formed. Accordingly, heat generated when the IC 140 is driven is configured to be discharged from the heat radiating fins 146 to the outside of the housing 42 via the heat radiating sheet 142, and temperature rise of the IC 140 can be prevented.

  Note that the optical transceiver module 12A and the optical transceiver module 12B form the convex portion 60 so as to be larger than the range covering the plurality of ICs 140, so that the mounting position of the IC 140 is between the optical transceiver module 12A and the optical transceiver module 12B. Even if they are different, the lid 44 can be made common.

  In addition, by painting the casing 42 and the lid 44 in black, there is an effect of reducing the surface temperature of the IC 140 by 6 to 7 ° C. as compared with a case where the casing 42 and the lid 44 are made of a metallic color in a no wind state.

  Furthermore, in the present embodiment, a description has been given of a configuration in which the rigid substrate 32 is installed on the bottom of the casing 42 with the mounting surface on which the electronic component is mounted on the upper side, and the casing 42 is closed with the lid 44. Is used with the lid 44 side facing down.

  On the other hand, as shown in FIG. 2, the rigid substrate 32 has a notch 50 formed at one corner, and is substantially L-shaped. As shown in FIG. 5, a stepped portion 56 is formed on the bottom of the housing 42 at a position corresponding to the notch 50 formed in the rigid substrate 32. A receptacle 54 as a holding member is placed on the stepped portion 56.

  The receptacle 54 has a substantially rectangular box shape, and a thin plate-like plate portions 62 and 63 are formed from the side surface 54A facing the other side 50B of the notch 50 (see FIG. 2) and the side surface facing the side surface 54A. Each is extended.

  The receptacle 54 is covered with the shield member 70 from above. The shield member 70 includes a substantially rectangular plate member 72, and arm members 74 and 76 that are substantially L-shaped when viewed from one direction are extended from one end of the plate member 72. The arm members 74 and 76 are formed at positions that overlap the plate portions 62 and 63 formed on the receptacle 54 when the receptacle 54 is covered with the shield member 70.

  Through holes 78 and 79 are formed in the arm members 74 and 76. The receptacles 54 are covered with the arm members 74 and 76 and the plate member 72, and screws 84 and 85 inserted into the through holes 78 and 79 and the through holes 80 and 81 formed in the plate portions 62 and 63 of the receptacle 54 are attached to the casing 42. Screwed into a screw hole (not shown) formed in the bottom. As a result, the receptacle 54 is covered with the shield member 70 and fixed to the bottom of the housing 42.

  Further, at the other end of the plate member 72, plate pieces 88 and 89 project along the side surface 54B of the receptacle 54 facing the one side 50A (see FIG. 2) of the notch 50. Screw holes 90 and 91 are formed in the plate pieces 88 and 89, respectively. Screws 96 and 97 inserted into through holes 94 and 95 formed in the rigid substrate 27 constituting the optical signal transmission unit 26, The rigid board 27 is held and fixed to the shield member 70 by being screwed into the screw holes 90 and 91. Thereby, the rigid substrate 27 is held and fixed to the side surface 54B of the receptacle 54.

  A concave portion 68 having a substantially U-shaped cross section is formed on the side surface 54B of the receptacle 54. When the rigid substrate 27 is held and fixed to the side surface 54B of the receptacle 54, the columnar optical transmission submodule 22 mounted on the rigid substrate 27 is inserted into the recess 68 and positioned.

  Further, a screw hole 65 is formed in the side surface 54A of the receptacle 54, and a screw 69 inserted into a through hole 67 formed in the rigid substrate 29 constituting the optical signal receiving unit 28 is screwed into the screw hole 65. As a result, the rigid substrate 29 is held and fixed to the side surface 54A.

  A substantially rectangular opening 66 is formed in the side surface 54A. When the rigid board 29 is held and fixed to the side surface 54A, the substantially rectangular columnar light receiving submodule 24 mounted on the rigid board 29 is inserted into the opening 66 and positioned.

  The rigid board 27 and the rigid board 32 are connected by a flexible part 46, and the rigid board 29 and the rigid board 32 are connected by a flexible part 48.

  As shown in FIG. 6, a connector 64 is provided on the side wall of the housing 42 on the extension line of the optical transmission submodule 22. The connector 64 to which the optical fiber cable 18 is connected is fitted to the connector 64, and the optical receiving submodule 24 is connected from the optical fiber cable 18 through the optical fiber 82 provided in the receptacle 54. An optical signal is input to the light receiving surface.

  Further, as shown in FIG. 2, a female connector 58 is attached to the rigid board 32 on the opposite side of the receptacle 54. A male connector 59 attached to the harness 61 of the shield cable 21 is fitted to the female connector 58. Thereby, a video signal or the like is transmitted from the host 16 (see FIG. 1) to the digital signal control unit 30 via the shielded cable 21.

  A female connector 52 is provided on the rigid board 32. A male connector 53 connected to one end of the electric cable 17 is fitted to the female connector 52, and a control signal is transmitted to the host 16 through the electric cable 17.

  The optical transmission / reception module 12B (see FIG. 1) connected to the monitor 14 side has a configuration similar to that of the optical transmission / reception module 12A, and a video signal is transmitted to the monitor 14 via the shield cable 34. A control signal from the monitor 14 is transmitted to the digital signal control unit.

  Further, as shown in FIG. 1, in the optical transceiver module 12B, an optical signal transmission composed of an optical transmission submodule (not shown) and a rigid board on which the optical transmission submodule is mounted on the side surface 54A of the receptacle 54. The unit 31 is held and fixed, and an optical signal receiving unit 25 including an optical receiving submodule (not shown) and a rigid board on which the optical receiving submodule is mounted is held and fixed on the side surface 54B.

  FIG. 6 is a view of the state in which the optical transceiver module 12A and the optical transceiver module 12B are arranged from above.

  The optical transmission sub-module 22 of the optical transmission / reception module 12A and the optical reception sub-module 24 of the optical transmission / reception module 12B have substantially the same configuration, but the functions are different between the side that transmits the optical signal and the side that receives the optical signal. Because of the difference, the optical reception submodule 24 is longer than the optical transmission submodule 22.

  More specifically, the light transmission sub-module 22 includes a light emitting element 130 and a lens 132. An optical signal emitted from the light emitting element 130 is collected by the lens 132 into the core of the optical fiber cable 18 and output. Is done.

  The light receiving submodule 24 includes a light receiving element 134 and two lenses 136 and 138, and optical signals input from the optical fiber cable 18 to the light receiving submodule 24 are collected by the lens 138 and the lens 136. The light is received and input to the light receiving element 134.

  With the above configuration, the optical reception submodule 24 to which an optical signal is input from the optical fiber cable 18 is longer than the optical transmission submodule 22 that outputs the optical signal to the optical fiber cable 18.

  Further, in order to make the position of the light emitting surface of the optical transmission submodule 22 connected to the connection surface with the optical fiber 82 and the position of the light receiving surface of the optical reception submodule 24 connected to the connection surface with the optical fiber 82 the same. The dimension of the shield member 71 in the transmission / reception direction of the optical signal is made longer than the dimension of the shield member 70 in the transmission / reception direction of the optical signal by the difference in length between the optical reception submodule 24 and the optical transmission submodule 22.

Correspondingly, the size of the optical signal in the transmission / reception direction of the notch 50 formed on the rigid board 32 of the optical transceiver module 12A is the same as that of the optical signal of the notch 51 formed on the rigid board 33 of the optical transceiver module 12B. It is made smaller than the dimension in the transmission / reception direction by the difference in length between the optical reception submodule 24 and the optical transmission submodule 22.
(Function)
The optical transmission submodule 22 of the optical transmission / reception module 12A connected to the host 16 side transmits an optical signal to the optical fiber cable 18, and the optical reception submodule 24 of the optical transmission / reception module 12B connected to the monitor 14 side An optical signal from the fiber cable 18 is received. As a result, the optical transmission sub-module 22 and the optical reception sub-module 24 have different optical systems arranged therein, so that the length of the optical signal reception direction is made longer than the length of the optical signal transmission direction. ing. That is, the optical reception submodule 24 is longer than the optical transmission submodule 22.

  Therefore, the notch 50 of the rigid board 32 of the optical transceiver module 12A is made shorter in the optical signal transmission / reception direction than the notch 51 formed on the rigid board 33 of the optical transceiver 12B. Thus, the length of the shield member 70 that connects the light emitting surface of the optical transmission submodule 22 to the connection surface of the optical fiber 82 and the length of the shield member 71 that connects the light receiving surface of the optical reception submodule 24 to the connection surface of the optical fiber 82. To absorb the difference.

  Accordingly, the overall size of the optical transceiver module 12A and the optical transceiver module 12B can be made the same. That is, since the housing 42 of the optical transceiver module 12A and the housing 43 of the optical transceiver module 12B can be formed in the same shape, the mold for creating the housing is common, and the manufacturing cost of the housing is reduced. be able to.

  Further, it is not necessary to change the sizes of the receptacle 54 on the optical transmission submodule 22 side and the receptacle 54 on the optical reception submodule 24 side in accordance with the difference in length between the optical transmission submodule 22 and the optical reception submodule 24. , The overall manufacturing cost can be lowered.

  Next, the optical transceiver module 12 mounted on the optical transceiver system 90 according to the second embodiment of the present invention will be described. In addition, the description about the part similar to 1st Embodiment is omitted.

  As shown in FIG. 7, the rigid board 40 of the optical transceiver module 12A and the rigid board 41 of the optical transceiver module 12B have the same shape (same size). And the length of the flexible part 92 which connects the rigid board | substrate 40 and the rigid board | substrate 27 of the optical signal transmission part 26 is longer than the length of the flexible part 93 which connects the rigid board | substrate 41 and the rigid board | substrate 35 of the optical signal receiving part 25, The length is increased by the difference in length between the shield member 70 and the shield member 71.

  Thus, the length of the shield member 70 that connects the light emitting surface of the optical transmission submodule 22 to the connection surface of the optical fiber 82 and the length of the shield member 71 that connects the light receiving surface of the optical reception submodule 24 to the connection surface of the optical fiber 82. The overall size of the optical transceiver module 12A and the optical transceiver module 12B can be made the same.

It is the perspective view which showed the optical transmission / reception system of the 1st Embodiment of this invention, uses an optical transmission / reception module for connecting an optical transmission / reception system between a host and a monitor, removes a cover, and the inside FIG. It is a perspective view which shows the optical transmission / reception module mounted in the optical transmission / reception system of the 1st Embodiment of this invention. It is a perspective view which shows the housing | casing used for the optical transmission / reception module mounted in the optical transmission / reception system of the 1st Embodiment of this invention. It is a fragmentary sectional view of the optical transmission / reception module mounted in the optical transmission / reception system of the 1st Embodiment of this invention. It is a disassembled perspective view which shows the receptacle of the optical signal transmission apparatus mounted in the optical transmission / reception system of the 1st Embodiment of this invention, the optical signal transmission part fixed to this, and an optical signal reception part. It is a top view which shows the state which arranged in the optical transmission / reception system of the 1st Embodiment of this invention the optical transmission / reception module connected to the host side, and the optical transmission / reception module connected to the monitor side. It is a top view which shows the state which arranged in the optical transmission / reception system of the 2nd Embodiment of this invention the optical transmission / reception module connected to the host side, and the optical transmission / reception module connected to the monitor side.

Explanation of symbols

10 Optical Transmission / Reception System 12A Optical Transmission / Reception Module (First Transmission Module)
12B optical transceiver module (second transmitter module)
18 Optical fiber cable (optical cable)
22 Optical Transmission Submodule (Transmission Submodule)
24 Optical receiving submodule (receiving submodule)
25 Rigid board (second module board)
27 Rigid board (first module board)
32 rigid board (first control board)
33 Rigid board (second control board)
54 Receptacle 70 Shield Member (First Shield Member)
71 Shield member (second shield member)
82 Optical fiber 90 Optical transmission / reception system 92 Flexible section (first flexible wiring board)
93 Flexible part (second flexible wiring board)

Claims (3)

A transmission sub-module that extends along the traveling direction of the optical signal, converts an electrical signal into an optical signal and transmits the signal, a first module board on which the transmission sub-module is mounted, and a transmission to the first module board A first control board that generates an electrical signal, a first flexible wiring board that connects the first module board and the first control board, and the first module board are held and connected to the connection surface with the optical fiber. A first transmission / reception module having a first shield member connecting a light emitting surface of the transmission submodule;
A receiving sub-module that extends along the traveling direction of the optical signal and that is longer than the transmitting sub-module and receives the optical signal, converts it into an electrical signal, and outputs it, and a second module on which the receiving sub-module is mounted Holding a board, a second control board for processing electrical signals from the second module board, a second flexible wiring board for connecting the second module board and the second control board, and holding the second module board A second transmission / reception module having a second shield member connecting the light receiving surface of the receiving submodule to the connection surface with the optical fiber;
In an optical transmission / reception system comprising:
An optical transmission / reception system for absorbing a difference in length between the first shield member and the second shield member by making the first flexible wiring board longer than the second flexible wiring board. A transmission sub-module that extends along the traveling direction of the optical signal, converts an electrical signal into an optical signal and transmits the signal, a first module board on which the transmission sub-module is mounted, and a transmission to the first module board A first control board that generates an electrical signal, a first flexible wiring board that connects the first module board and the first control board, and the first module board are held and connected to the connection surface with the optical fiber. A first transmission / reception module having a first shield member connecting a light emitting surface of the transmission submodule;
A receiving sub-module that extends along the traveling direction of the optical signal and that is longer than the transmitting sub-module and receives the optical signal, converts it into an electrical signal, and outputs it, and a second module on which the receiving sub-module is mounted Holding a board, a second control board for processing electrical signals from the second module board, a second flexible wiring board for connecting the second module board and the second control board, and holding the second module board A second transmission / reception module having a second shield member connecting the light receiving surface of the receiving submodule to the connection surface with the optical fiber;
In an optical transmission / reception system comprising:
The difference in length between the first shield member and the second shield member is set such that the length of the optical signal transmitted and received in the first control board is longer than the length of the optical signal transmitted and received in the second control board. An optical transmission / reception system characterized by absorbing the light.   The optical transmission / reception system according to claim 1 or 2, wherein the first transmission / reception module and the second transmission / reception module are mounted in a casing having the same shape.

Images