JP2007287854A - Optical module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical module that can control the inrush current and voltage variation occurring when a wired substrate is actively inserted into an optical communication apparatus regardless of wiring density of the substrate, with sufficient reliability. <P>SOLUTION: The optical module 10 is provided with the wired substrate 18. The wired substrate 18 includes a plurality of terminal patterns 8 in contact with a connector terminal 102b of the optical communication apparatus body. Of the plurality of terminal patterns 8, a power supply terminal pattern 82 and a signal terminal pattern 84 are respectively divided into a plurality of terminals 82a, 82b and 84a, 84b arranged in the loading and unloading direction. The plurality of terminals 82a, 82b are mutually connected electrically via a resistance element 86 and the resistance element 86 is embedded within the wired substrate 18. Similarly, the plurality of terminals 84a, 84b are also electrical connected via the a resistance element 90 and the resistance element 90 is embedded within the wired substrate 18. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an optical module that can be inserted into and removed from an optical communication apparatus main body.

  2. Description of the Related Art In recent years, in an optical communication system, a hot-pluggable (hot pluggable) type optical module that can be inserted into and removed from a slot of a host device without turning off the power of the host device (optical communication device) is often used. Yes. In such a hot-swap type optical module, in order to protect the circuit on the host device side, an inrush current generated in the power supply line or a voltage fluctuation generated in the signal line when the hot plug is inserted into the slot of the host device. Is required to be suppressed.

  For example, in the hot-swap circuit device disclosed in Patent Document 1, the bus line terminals arranged on the printed circuit board are divided and connected by resistance elements, so that the terminals are hot-plugged into the connector on the host device side. When doing so, the operation level of the bus line on the host device side is not disturbed. Further, in the contact structure disclosed in Patent Document 2, in a contact used for an electrical connector for hot-swap, a resistance material layer is embedded from the tip of the contact to the middle portion to form a flat contact surface, Current surges and the like are prevented by making contact through the resistive material layer in the initial contact stage with the contact.

JP 2001-034365 A JP 11-297391 A

  However, the configuration disclosed in Patent Document 1 has the following problems. That is, generally, the vicinity of the terminal is a mounting prohibited area, and the resistance element must be arranged at a location away from the terminal. In addition, since the wiring density tends to be dense in the region near the terminal on the wiring board, it is often difficult to add a wiring pattern for connecting the resistance element and the terminal.

  Further, in the configuration disclosed in Patent Document 2, the resistance material layer is in contact with the mating contact. However, since the resistance material is generally more brittle than the terminal material (mainly metal), Defects and peeling occur due to repeated contact with the manufactured counterpart contact, and reliability cannot be ensured.

  The present invention has been made in view of the above problems, and can suppress inrush current and voltage fluctuation when hot-plugged into the optical communication apparatus main body regardless of the wiring density of the wiring board and ensure reliability. An object is to provide an optical module.

  In order to solve the above-described problems, an optical module of the present invention is an optical module that forms part of an optical communication device and can be inserted into and removed from the optical communication device main body, and includes at least one of a light emitting unit and a light receiving unit. An optical functional unit and an electronic component electrically connected to the optical functional unit are mounted, and a wiring board having a terminal pattern in contact with a connector terminal of the optical communication device main body is provided at the edge, and at least one terminal pattern is Divided into a plurality of terminal portions arranged in the insertion / extraction direction, the plurality of terminal portions are electrically connected to each other through a resistance element, and the resistance element is embedded in the wiring board, To do.

  In the optical module described above, the terminal pattern provided on the wiring board is divided into a plurality of terminal portions arranged in the insertion / extraction direction, and the adjacent terminal portions are electrically connected to each other through a resistance element. Therefore, when this optical module is hot-plugged into the connector of the optical communication apparatus main body, the wiring of the wiring board is first electrically connected to the connector terminal of the optical communication apparatus main body through the resistance element, and then the connector Shorted to the terminal. Thereby, since the inrush current in the power supply line and the voltage fluctuation in the signal line are suitably suppressed, the circuit on the optical communication device main body side can be effectively protected.

  Further, in the optical module described above, the resistance elements between the plurality of terminal portions are embedded in the wiring board, so that the resistance elements can be arranged in the vicinity of the terminal pattern. Therefore, the above configuration can be applied regardless of the wiring density of the wiring board. Further, in the above-described optical module, it is a plurality of terminal portions of the terminal pattern that come into contact with the connector terminal on the optical communication apparatus main body side, and the resistance element does not contact the connector terminal. Can be secured.

  In the optical module, the wiring board has, as terminal patterns, a grounding terminal pattern corresponding to the grounding line of the wiring board, a power supply terminal pattern corresponding to the power supply line, and a signal terminal pattern corresponding to the signal line. The at least one terminal pattern may include a power supply terminal pattern. Thereby, the rush current in a power supply line can be suppressed suitably.

  In the optical module, the wiring board has, as terminal patterns, a grounding terminal pattern corresponding to the grounding line of the wiring board, a power supply terminal pattern corresponding to the power supply line, and a signal terminal pattern corresponding to the signal line. The at least one terminal pattern may include a signal terminal pattern. Thereby, the voltage fluctuation in a signal line can be controlled suitably.

  Further, the optical module may be characterized in that a plurality of terminal portions facing each other are along a direction obliquely intersecting with a longitudinal direction of a contact area between the wiring board and the connector terminal. In the optical module described above, the contact area moves through the plurality of terminal portions of the terminal pattern when inserted into the optical communication device body. At this time, the contact area needs to pass through the gaps of the plurality of terminal portions, but according to this optical module, the connector terminal can always contact any one of the terminal portions of the terminal pattern while passing through the gaps. Therefore, the contact state between the connector terminal on the optical communication apparatus main body side and the terminal pattern on the optical module side can be suitably maintained.

  According to the present invention, it is possible to provide an optical module that can suppress inrush current and voltage fluctuation when hot-plugged into the optical communication device main body regardless of the wiring density of the wiring board and can ensure reliability.

  Hereinafter, preferred embodiments of an optical module according to the present invention will be described in detail with reference to the drawings. In the description of the drawings, the same or corresponding parts are denoted by the same reference numerals, and redundant description is omitted.

  1 and 2 are diagrams showing a configuration of an optical module which is a preferred embodiment of the present invention. FIG. 1 is a plan view showing the optical module 10 of the present embodiment, and FIG. 2 is a side sectional view taken along the line II of the optical module 10 shown in FIG. The optical module of the present embodiment is an optical transceiver that forms a part of an optical communication device and can be hot-plugged into and removed from the optical communication device main body. 2 also shows a connector (host connector) 102 on the optical communication apparatus main body side.

  As shown in FIGS. 1 and 2, the optical module 10 includes a light emitting unit 12, a light receiving unit 14, a wiring board 18 on which a plurality of electronic components 16 are mounted, and a housing 40. Among these, the light emitting unit 12 and the light receiving unit 14 constitute an optical function unit 20 in the present embodiment.

  The light emitting unit 12 is a component for converting an electrical transmission signal into an optical signal and transmitting it to the outside of the optical communication device, and is disposed at the front edge of the wiring board 18. The light emitting unit 12 includes a substantially cylindrical package 12a having a light emitting element (for example, a laser diode) and the like, and a substantially cylindrical light guide portion 12b for guiding light. The light guide portion 12b includes a ferrule through which an optical fiber is inserted, a sleeve for holding the ferrule, and the like. Three lead pins 24 are extended from the base of the package 12a. These lead pins 24 include, for example, a signal line (positive phase) pin, a signal line (reverse phase) pin, and a signal line (monitor photodiode current) pin.

  The light receiving unit 14 is a component for converting an optical signal sent to the optical communication device into an electrical reception signal, and is arranged alongside the light emitting unit 12 on the front edge portion of the wiring board 18. The light receiving unit 14 includes a substantially cylindrical package 14a having a light receiving element (for example, a photodiode) and a preamplifier therein, and a substantially cylindrical light guiding portion 14b for guiding light. The light guide portion 14b includes a ferrule through which an optical fiber is inserted, a sleeve for holding the ferrule, and the like. Five lead pins 26 are extended from the base of the package 14a. These lead pins 26 include, for example, a signal line (positive phase) pin, a signal line (reverse phase) pin, a power supply line (photodiode reverse bias) pin, a power supply line (Vcc) pin, and a ground line pin. Become.

  The wiring board 18 is a resin multilayer printed wiring board whose outer shape is substantially rectangular. Both the front surface 18a and the back surface 18b of the wiring board 18 are electrically connected to the lead pins 24 of the light emitting unit 12 and are electrically connected to the lead pins 26 of the light receiving unit 14 and the driver ICs that control the driving of the light emitting unit 12. A plurality of electronic components 16 including an IC and the like for processing signals received from the light receiving unit 14 are mounted.

  A plurality of terminal patterns 8 for making electrical contact with the host connector 102 mounted on the mounting substrate 100 of the optical communication apparatus main body are formed on the rear edge portion of the back surface 18b of the wiring substrate 18. The plurality of terminal patterns 8 include a ground line terminal pattern, a power line terminal pattern, a signal line terminal pattern, and the like.

  The housing 40 has a host connector housing portion 42 provided near the rear edge of the wiring board 18, an optical connector housing portion 44 provided in front of the light emitting unit 12 and the light receiving unit 14, and a surface 18 a of the wiring board 18. And an upper wall portion 46 extending along. The optical connector housing portion 44 has a pair of housing holes 44 a and 44 b for housing the optical connector 104 (see FIG. 2) connected to the optical fiber 106. The pair of receiving holes 44a and 44b are provided corresponding to the light emitting unit 12 and the light receiving unit 14, respectively.

  As shown in FIG. 2, the optical module 10 is inserted into and removed from the host connector 102 provided on the mounting board 100 of the optical communication apparatus main body. The insertion / extraction direction A coincides with the front-rear direction of the wiring board 18. The host connector 102 has a recess 102 a that fits with the wiring board 18, and a plurality of connector terminals that are in electrical contact with the plurality of terminal patterns 8 provided at the rear edge of the wiring board 18 are provided in the recess 102 a. 102b is provided. Therefore, when the rear edge portion of the wiring board 18 is inserted into the host connector 102, electrical connection between the terminal pattern 8 of the wiring board 18 and the connector terminal 102b of the host connector 102 is achieved. Further, the optical module 10 of the present embodiment has a configuration capable of so-called hot-plugging (hot plugging), in which it is not necessary to turn off the power supply of the optical communication apparatus body when inserted into the host connector 102.

  Here, the configuration of the terminal pattern 8 will be described in more detail. FIG. 3 is a back view showing the configuration of the terminal pattern 8. 4 is a cross-sectional view taken along line II-II (or line III-III) of the terminal pattern 8 shown in FIG.

  As shown in FIGS. 3 and 4, the plurality of terminal patterns 8 are respectively provided on the back surface 18 b of the rear edge portion of the wiring board 18 (that is, in the vicinity of the rear end 18 c of the wiring board 18). Each extending along. The plurality of terminal patterns 8 include a ground terminal pattern 80 corresponding to the ground line 28 of the wiring board 18, a power terminal pattern 82 corresponding to the power line 30, and a signal line 32 (a bus line such as a serial bus, a binary value). Signal terminal pattern 84 corresponding to a control signal line for sending a signal).

  Among these terminal patterns 8, the power supply terminal pattern 82 is divided into a plurality of terminal portions 82 a and 82 b arranged along the insertion / extraction direction A. The plurality of terminal portions 82 a and 82 b are electrically connected via a resistance element 86 embedded in the wiring substrate 18. The signal terminal pattern 84 is divided into a plurality of terminal portions 84 a and 84 b arranged along the insertion / extraction direction A. The plurality of terminal portions 84 a and 84 b are electrically connected via a resistance element 90 embedded in the wiring board 18.

  That is, as shown in FIG. 4, the resistance element 86 is embedded below the power supply terminal pattern 82 inside the wiring substrate 18. One end of the resistance element 86 is electrically connected to the terminal portion 82a of the power supply terminal pattern 82 through the embedded wiring 88a. The other end of the resistance element 86 is electrically connected to the terminal portion 82b of the power supply terminal pattern 82 through the embedded wiring 88b. Further, the resistance element 90 is embedded in the wiring substrate 18 below the signal terminal pattern 84. One end of the resistance element 90 is electrically connected to the terminal portion 84a of the signal terminal pattern 84 through the embedded wiring 92a. The other end of the resistance element 90 is electrically connected to the terminal portion 84b of the signal terminal pattern 84 through the embedded wiring 92b.

  Further, as shown in FIG. 3, the distance D1 from the rear end 18c of the wiring board 18 to the grounding terminal pattern 80 is the distance D2 from the rear end 18c to the power supply terminal pattern 82 and the signal terminal from the rear end 18c. It is shorter than the distance D3 to the pattern 84. The distance D3 from the rear end 18c to the signal terminal pattern 84 is longer than the distance D1 from the rear end 18c to the ground terminal pattern 80 and the distance D2 from the rear end 18c to the power terminal pattern 82. Yes. Therefore, in the terminal pattern 8 of the present embodiment, the relationship between the distances D1 to D3 is D1 <D2 <D3.

  The dimensions of each terminal pattern 8 are exemplified as follows. The width of each terminal pattern 8 is 0.6 mm. The length of each terminal pattern 8 (the length between both ends including all terminal portions when a plurality of terminal portions are included) is 3.0 mm for the grounding terminal pattern 80 and 2 for the power supply terminal pattern 82. .6 mm, and the signal terminal pattern 84 is 2.2 mm. The interval between the terminal patterns is 0.2 mm. As examples of the constituent material of each terminal pattern 8, copper (wiring material, thickness 38 μm), nickel (base material, thickness 2 μm), and gold (surface coating material, thickness 1 μm) are suitable. Moreover, when the constituent material of the wiring board 18 is illustrated, a weather-resistant glass base epoxy resin laminated board (FR-4), a polyimide board (in the case of a rigid flex board), etc. are suitable. The thickness of the wiring board 18 is 1 mm, for example.

  Of the operations of the optical module 10 having the above-described configuration, operations regarding the terminal pattern 8 will be described. When the optical module 10 is hot-plugged into the host connector 102 of the optical communication apparatus main body, first, the grounding terminal pattern 80 comes into contact with the corresponding connector terminal on the host connector 102 side. As a result, the reference potential (GND potential) of the optical communication apparatus main body matches the reference potential of the optical module 10.

  When the insertion is continued, the terminal portion 82b of the power terminal pattern 82 comes into contact with the corresponding connector terminal on the host connector 102 side. As a result, a power supply voltage is supplied from the optical communication apparatus main body to the optical module 10, and at this time, a current flows to the power supply line 30 via the resistance element 86. Thereafter, when the optical module 10 is further inserted, the terminal portion 82a of the power terminal pattern 82 comes into contact with the connector terminal, and the connector terminal and the power supply line 30 are short-circuited. As a result, a normal power supply voltage is supplied to the power supply line 30.

  When the insertion is continued, the terminal portion 84b of the signal terminal pattern 84 comes into contact with the corresponding connector terminal on the host connector 102 side. Thereby, the signal lines (bus line, binary signal line, etc.) of the optical communication apparatus main body and the signal line 32 on the optical module 10 side are electrically connected. At this time, these signal lines are connected to the resistance element 90. Connected through. Thereafter, when the optical module 10 is further inserted, the terminal portion 84a of the signal terminal pattern 84 comes into contact with the connector terminal, and the connector terminal and the signal line 32 are short-circuited. This makes it possible to input and output electrical signals between the signal line 32 and the optical communication device body.

The effect obtained by the optical module 10 of the present embodiment will be described. Here, a graph G1 shown in FIG. 5A is a graph showing an example of a waveform of an inrush current generated in the power supply line when an optical module having a conventional terminal pattern is hot-inserted into the host connector. A graph G <b> 2 shown in FIG. 5B is a graph showing an example of a waveform of the power supply current when the optical module 10 of the present embodiment is hot-inserted into the host connector 102. FIG. 5 (a) and 5 (b) shows the case where the connector terminal of the power supply terminal pattern of the optical module side optical communication apparatus main body is in contact with the time t _0.

Generally, the power supply line has a low impedance, and a capacitive element such as a bypass capacitor is connected as a load. Therefore, in the conventional optical module, the capacitor element is charged at the moment of contact with the host connector terminal. A large current (inrush current) flows (waveform B _{1 in} FIG. 5A). As a result, a load is applied to the power supply circuit of the optical communication apparatus main body. On the other hand, in the optical module 10 of the present embodiment, the power line 30 is first connected to the power line on the optical communication apparatus main body side via the resistance element 86. Therefore, the occurrence of inrush current is suppressed, and the power supply current value rises gently (waveform B _{2 in} FIG. 5B). Thereafter, when the optical module 10 is further inserted, the power supply line 30 and the power supply line on the optical communication apparatus main body side are short-circuited.

  Thus, according to the optical module 10 of this embodiment, since the inrush current in the power supply line 30 at the time of hot-line insertion can be suitably suppressed, the power supply circuit on the optical communication apparatus main body side can be effectively protected.

A graph G3 illustrated in FIG. 6A is a graph illustrating an example of a change in voltage of the signal line on the optical communication device main body side when a conventional optical module having a terminal pattern is hot-plugged into the host connector. A graph G4 shown in FIG. 6B is a graph showing an example of a voltage change of the signal line on the optical communication apparatus main body side when the optical module 10 of this embodiment is hot-plugged into the host connector 102. . Also in FIGS. 6 (a) and 6 (b), it is assumed that the connector terminal and the signal terminal pattern of the optical module side optical communication apparatus main body is in contact with the time t _0.

In general, when the signal line on the optical module side is not connected to the optical communication apparatus main body, the potential may be indefinite. Therefore, in the conventional optical module, the signal line on the optical module side (potential indeterminate) and the signal line on the optical communication apparatus main body side are short-circuited at the moment of contact with the host connector terminal. There may be a large voltage fluctuation (waveform C _{1 in} FIG. 6A). On the other hand, in the optical module 10 of the present embodiment, the signal line 32 is first connected to the signal line on the optical communication apparatus main body side via the resistance element 90. Therefore, it is possible to suppress the influence of the indefinite potential of the signal line 32 and reduce the voltage fluctuation of the signal line on the optical communication apparatus main body side (waveform C _{2 in} FIG. 6B).

  In addition, when the signal line includes a serial bus, the serial bus on the optical communication apparatus main body side communicates with other devices and the like even when hot inserting the optical module. Therefore, in the conventional optical module, noise such as a surge is generated due to contact between the host connector terminal and the signal terminal pattern, which may interfere with serial bus communication. On the other hand, according to the optical module 10 of the present embodiment, since the signal line 32 is first connected to the signal line on the optical communication apparatus main body side via the resistance element 90, generation of noise is suppressed, and serial bus communication is performed. Can be reduced. Such an effect is effective not only for a serial bus but also for all circuits connected to the bus.

  As described above, according to the optical module 10 of the present embodiment, voltage fluctuation and noise in the signal line on the optical communication device main body side at the time of hot insertion can be suitably suppressed, so that the signal line on the optical communication device main body side is effective. Can be protected.

  Further, in the optical module 10 of the present embodiment, since the resistance elements 86 and 90 are embedded in the wiring board 18, the resistance elements 86 and 90 can be disposed in the vicinity of the terminal pattern 8. Therefore, a configuration in which the plurality of terminal portions 82a and 82b (84a and 84b) are connected via the resistance element 86 (90) can be applied regardless of the wiring density of the wiring board 18. Further, in the power supply terminal pattern 82 and the signal terminal pattern 84, a plurality of terminal portions 82a, 82b and 84a, 84b are in contact with the connector terminal 102b on the optical communication apparatus main body side, and the resistance elements 86 and 90 are Since it does not come into contact with the connector terminal 102b, the same reliability as that of a general terminal pattern can be ensured.

  Further, as in the present embodiment, the distance D1 from the rear end 18c of the wiring board 18 to the ground terminal pattern 80 is the distance D2 from the rear end 18c to the power supply terminal pattern 82 and the signal terminal from the rear end 18c. It is preferably shorter than the distance D3 to the pattern 84. As a result, when the live line is inserted, the power supply line 30 and the signal line 32 are electrically connected to the optical communication apparatus main body after the ground potential is determined in the optical module 10, and thus the circuit on the optical module 10 side can be suitably protected.

  Further, as in this embodiment, the distance D3 from the rear end 18c of the wiring board 18 to the signal terminal pattern 84, the distance D1 from the rear end 18c to the ground terminal pattern 80, and the power terminal from the rear end 18c. It is preferably longer than the distance D2 to the pattern 82. As a result, when hot-plugging is performed, signal input / output can be started in a state where the power supply voltage is suitably supplied to the optical module 10, and thus the circuit on the optical module 10 side can be suitably protected.

  In this embodiment, when the optical module 10 is hot-plugged into the host connector 102, the contact area between the connector terminal 102b and the power supply terminal pattern 82 (or the signal terminal pattern 84) is the terminal portion 82b. (84b) moves to the terminal portion 82a (84a). At this time, the contact area inevitably passes through the gap between the terminal portion 82a (84a) and the terminal portion 82b (84b). Therefore, the gap between the terminal portion 82a (84a) and the terminal portion 82b (84b) is such that when the contact region passes through the gap, the connector terminal 102b is connected to at least one of the terminal portions 82a and 82b (84a and 84b). It is preferable to set so that it may contact. Alternatively, the gap between the terminal portion 82a (84a) and the terminal portion 82b (84b) allows the connector terminal 102b to contact either of the terminal portions 82a and 82b (84a and 84b) in consideration of a general module insertion speed. It may be set so that the non-performing time is less than the specified time.

(Modification)
FIG. 7A is a diagram illustrating a configuration of a terminal pattern 94 according to a modification of the present embodiment. FIG. 7B is a diagram showing a configuration of a terminal pattern 96 according to another modification of the present embodiment. FIG. 7C is a perspective view showing a general shape of a connector terminal 102b included in the host connector 102. FIG.

  Referring to FIG. 7A, the terminal pattern 94 is divided into a plurality of terminal portions 94a and 94b. The terminal portions 94a and 94b are electrically connected to each other via a resistance element 76 embedded in the wiring board 18. The sides 94c and 94d of the terminal portions 94a and 94b that face each other between the terminal portions 94a and 94b are in contact with the wiring board 18 (see FIGS. 1 and 2) and the connector terminal 102b (FIG. 7C). It is formed along a direction (in this modified example, an inclined direction) that intersects the longitudinal direction of the region (contact region E).

  7B, the terminal pattern 96 is divided into a plurality of terminal portions 96a and 96b. The terminal portions 96a and 96b are electrically connected to each other via a resistance element 78 embedded in the wiring board 18. The side portions 96c and 96d of the terminal portions 96a and 96b facing each other between the terminal portions 96a and 96b are formed in a saw blade shape, and the line segments constituting the saw blade shape in the sides 96c and 96d are in contact with each other. Along the direction (inclination direction) intersecting the longitudinal direction of the region E.

  Here, the shape of the contact region E depends on the shape of the connector terminal 102b. As shown in FIG. 7C, the general connector terminal 102b has a shape in which the contact portion F with the wiring board is bent in order to facilitate insertion and removal of the optical module. Moreover, in order to ensure a contact area with the terminal pattern on the optical module side, the connector terminal 102b is formed to have a wide cross section. Therefore, the shape of the contact region E is generally elongated, and the longitudinal direction thereof is often orthogonal to the insertion / extraction direction A. In addition, the longitudinal direction of the contact area E in this modification is not restricted to the direction orthogonal to the insertion / extraction direction A.

  The plurality of terminal portions of the power supply terminal pattern and the signal terminal pattern of the optical module may have a shape as in this modification. When the optical module is inserted into the host connector 102, the contact area E between the connector terminal 102 b and the terminal pattern 94 (or 96) extends along the insertion / extraction direction A in the terminal portion 94 b ( 96b) to terminal portion 94a (96a). At this time, the contact region E needs to pass through the gaps between the terminal portions 94a and 94b (96a and 96b). According to this modification, the connector terminal 102b is connected to the terminal pattern 94 (while passing through the gap). 96), the contact state between the connector terminal 102b of the host connector 102 and the terminal pattern 94 (96) on the optical module side can be suitably maintained.

  The optical module according to the present invention is not limited to the above embodiment, and various modifications are possible. For example, in the above embodiment, the power terminal pattern and the signal terminal pattern among the plurality of terminal patterns are divided into the plurality of terminal portions, but at least one terminal pattern of the plurality of terminal patterns is a plurality of terminals. By being divided into portions, the effect of the present invention can be suitably obtained in the signal line (or power supply line) corresponding to the terminal pattern. For example, various modes are possible, such as a configuration in which only one of the power supply terminal pattern and the signal terminal pattern is divided into a plurality.

  Moreover, in the said embodiment and modification, although the terminal pattern is divided | segmented into two terminal parts, a terminal pattern may be divided | segmented into three or more terminal parts. In this case, adjacent terminal portions are preferably connected to each other through a resistance element embedded in the wiring board. Thereby, the effect of the present invention can be obtained more effectively.

  In the above embodiment, an optical transceiver including both a light emitting unit and a light receiving unit has been described as an example of an optical module to which the present invention can be applied. However, the present invention can also be applied to an optical module including only one of a light emitting unit and a light receiving unit.

FIG. 1 is a plan view showing a configuration of an optical module which is a preferred embodiment of the present invention. FIG. 2 is a side cross-sectional view taken along line II of the optical module shown in FIG. FIG. 3 is a back view showing the configuration of the terminal pattern. 4 is a cross-sectional view taken along line II-II (or line III-III) of the terminal pattern shown in FIG. FIG. 5A is a graph showing an example of a waveform of an inrush current generated in a power supply line when an optical module having a conventional terminal pattern is hot-inserted into a host connector. FIG. 5B is a graph showing an example of the waveform of the power supply current when the optical module of the present embodiment is hot-inserted into the host connector. FIG. 6A is a graph showing an example of a change in voltage of a signal line on the optical communication apparatus main body side when an optical module having a conventional terminal pattern is hot-plugged into a host connector. FIG. 6B is a graph showing an example of a voltage change of the signal line on the optical communication apparatus main body side when the optical module of the present embodiment is hot-plugged into the host connector. FIG. 7A is a diagram illustrating a configuration of a terminal pattern according to a modification. FIG. 7B is a diagram illustrating a configuration of a terminal pattern according to another modification. FIG. 7C is a perspective view showing a general shape of a connector terminal included in the host connector.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 8 ... Terminal pattern, 10 ... Optical module, 12 ... Light emitting unit, 14 ... Light receiving unit, 16 ... Electronic component, 18 ... Wiring board, 20 ... Optical function part, 24, 26 ... Lead pin, 28 ... Ground line, 30 ... Power supply Line 32, signal line 80, ground terminal pattern, 82 power terminal pattern, 82a, 82b, 84a, 84b terminal portion, 84 signal terminal pattern, 86, 90 resistance element, 102 host connector 102b: Connector terminals.

Claims (4)

An optical module that forms part of the optical communication device and is removable from the optical communication device body,
An optical function unit including at least one of the light emitting unit and the light receiving unit;
An electronic component electrically connected to the optical functional unit, and a wiring board having a terminal pattern in contact with a connector terminal of the optical communication device main body;
At least one of the terminal patterns is divided into a plurality of terminal portions arranged in the insertion / extraction direction, and the plurality of terminal portions are electrically connected to each other via a resistance element,
The optical module, wherein the resistance element is embedded in the wiring board. The wiring board has, as the terminal pattern, a grounding terminal pattern corresponding to the grounding line of the wiring board, a power supply terminal pattern corresponding to the power supply line, and a signal terminal pattern corresponding to the signal line,
The optical module according to claim 1, wherein the at least one terminal pattern includes the power supply terminal pattern. The wiring board has, as the terminal pattern, a grounding terminal pattern corresponding to the grounding line of the wiring board, a power supply terminal pattern corresponding to the power supply line, and a signal terminal pattern corresponding to the signal line,
The optical module according to claim 1, wherein the at least one terminal pattern includes the signal terminal pattern.   The side of the plurality of terminal portions facing each other is along a direction obliquely intersecting with a longitudinal direction of a contact region between the wiring board and the connector terminal. An optical module according to claim 1.

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