JP4398488B2 - Optical communication module and optical communication module container - Google Patents

Description

The present invention relates to optical communication module, particularly relates to an optical communication module with a fixed receptacle for connecting an optical element and an optical component.

  In the field of optical communication devices that have been aimed at miniaturization, the communication device is modularized so that it can be attached to and detached from a case or the like. For example, a light emitting / receiving element such as a semiconductor laser or a photodiode is housed in a case, this case is provided facing the end face of the optical fiber, and an optical signal is incident on or emitted from the end face of the optical fiber, and light is transmitted through the optical fiber. Receptacles for introducing or deriving signals have been proposed.

  Further, for further miniaturization, there has been proposed one that provides at least one optical transmission module and one optical reception module in one housing to provide one channel for optical communication as one unit.

  In order to improve the reliability of such optical communication modules, it is important to shield the optical connections so that unnecessary high-frequency signals do not leak outside the module. It becomes a difficult task.

  As shown in FIG. 1, the optical module disclosed in Patent Document 1 is provided with a fixing jig for sandwiching a receptacle from above and below, and the fixing jig is fixed to a case.

JP 2005-249892 A

  However, the fixing method of Patent Document 1 is a configuration in which the receptacle is only fixed to the case, and a high-frequency signal leaks from a connection portion between the receptacle and the optical fiber connector portion.

  In addition, the method of fixing the receptacle to the housing with an adhesive is also taken, but since the optical axis of the optical fiber, light emission, and light receiving element are aligned, the assembly work is inefficient and attachment and removal are not possible. There was a problem that could not be easily done.

The present invention has been made in view of the above problems, it is fixed to the stable housing of the receptacle, and an object thereof is to provide a module for optical communication suppress the leakage of high frequency signals.

In order to solve the above problems, the present invention comprises an optical element comprising a light- emitting element or a light-receiving element in an optical element housing part, having a fiber connection part to which an optical fiber is connected and a protrusion, and the surface is conductive A receptacle that is electrically conductive with the receptacle and the optical element in the receptacle, has a smaller diameter than the projection, and is electrically conductive; and the projection Smaller than the opening into which the receptacle is inserted, an engaging portion that engages with the locking portion of the housing, and a fulcrum portion that acts as a fulcrum when pressing the protrusion. A pressing jig having a gap between the optical element storage portion and the projection, the opening of the pressing jig is fitted, and a fulcrum portion of the pressing jig is fitted in a recess of the housing, and Fiber connection part of the housing The engaging portion of the pressing jig is locked to the locking portion of the casing while the peripheral portion of the opening of the pressing jig presses the protruding portion against the casing. In this manner, the projection portion completely closes the hole of the housing in a state where the receptacle is urged in the optical axis direction and the optical axis of the receptacle is aligned. It is a module. According to the present invention, since the engaging portion of the pressing jig is locked to the housing in a state where the pressing jig presses the protrusion provided on the receptacle to the housing, the receptacle can be easily and stably attached to the housing. Can be fixed. In addition, since the protrusion of the receptacle is pressed against the housing, leakage of high frequency signals can be suppressed.

  The said structure WHEREIN: The said housing | casing can be set as the structure by which the said several receptacle is accommodated. In the above configuration, the pressing jig may be configured to press the plurality of receptacles. According to this configuration, a plurality of receptacles can be fixed to the housing at a time.

  The said structure WHEREIN: It can be set as the structure provided with the said several pressing jig provided corresponding to each of these several receptacles.

The said structure WHEREIN: It can be set as the structure formed by interposing a plate-shaped spacer between the said pressing jig and the projection part of the said receptacle. According to this configuration, the strength of the pressing jig can be reinforced.

  According to the present invention, since the engaging portion of the pressing jig is locked to the housing in a state where the pressing jig presses the protrusion provided on the receptacle to the housing, the receptacle can be easily and stably attached to the housing. Can be fixed. In addition, since the protrusion of the receptacle is pressed against the housing, leakage of high frequency signals can be suppressed.

  Preferred embodiments of the present invention will be described with reference to the accompanying drawings.

The first embodiment is an example of an SFP + (Small Form Factor Pluggable +) type transceiver. FIG. 2A is a perspective view in which the cover is removed from the housing of the optical communication module according to the first embodiment, and FIG. 2B is a perspective view in which the housing is attached to the cover. As shown in FIG. 2A, the metal housing 30 accommodates two (plural) receptacles 20 using a metal jig 10 (pressing jig). For example, the housing 30 is made of a metal material such as zinc die casting, and the receptacle 20 is made of a metal material such as stainless steel. The jig 10 is made of a metal such as stainless steel or phosphor bronze having a spring property or a plastic material, and the engaging portion 14 (engagement opening) is engaged with the locking portion 34 (locking convex portion) of the housing 30. As a result, the two receptacles 20 are fixed to the housing 30. In the two receptacles 20, an optical transmission unit and an optical reception unit each formed of a sleeve, a ferrule containing a fiber, a lens, an optical element (light emitting element or light receiving element), a holder, and the like are formed. A circuit board 40 is screwed to the housing 30 using screws 42. A transmission / reception circuit (not shown) is provided under the circuit board 40. The transmission / reception circuit transmits an electrical signal to the optical transmission unit, transmits a light from the optical transmission unit to the optical fiber, and receives an electrical signal output from the optical reception unit that receives the light from the optical fiber. Circuit. A cable 48 is provided for connecting an optical element (not shown) in the receptacle 20 and a transmission / reception circuit to input / output an electric signal. In the subsequent drawings, the cable 48 is omitted. As shown in FIG. 2B, when the cover 55 is fitted into the housing 30, the receptacle 20 and the circuit board 40 are protected by the cover 55.

  FIG. 3A is a perspective view of the jig. The jig 10 includes the opening 18 through which the receptacle 20 passes, the pressing portion 12 that presses the projection 22 of the receptacle 20 around the opening 18, and the locking of the casing 30 while pressing the projection 22 against the casing 30. And an engaging portion 14 that engages with the portion 34. FIG. 3B and FIG. 3C are perspective views showing the relationship between the receptacle 20 and the jig 10. The receptacle 20 includes a fiber connection portion 24 to which an optical fiber is connected, a protrusion 22 with which the pressing portion 12 of the jig 10 abuts, and an optical element storage portion 21 in which an optical element is stored. A space between the optical element storage portion 21 and the protrusion 22 of the receptacle 20 is fitted into the opening 18 of the jig 10, and the pressing portion 12 contacts the protrusion 22.

FIG. 4 is an exploded perspective view in which the housing 30, the receptacle 20, and the circuit board 40 are disassembled. The fiber connection portion 24 of the receptacle 20 is inserted into the hole 32 provided in the housing 30, and the pressing portion 12 of the jig 10 presses the protruding portion 22 of the receptacle 20, whereby the receptacle 20 is fixed to the housing 30. . The engaging portion 14 engages with the locking portion 34 of the housing 30. At this time, the fulcrum portion 16 is fitted into the recess 36 of the housing 30 and acts as a fulcrum when pressing the projection 22 of the receptacle 20. Thereby, the jig 10 is fixed to the housing 30. The circuit board 40 is accommodated in the circuit board accommodating portion 46 in the housing 30. The protrusion 35 provided on the locking portion 34 is a protrusion for engaging with an external connector when the optical communication module is connected to the external connector.

  A method of fixing the receptacle 20 to the housing 30 using the jig 10 will be described with reference to FIGS. 5A and 5B are cutaway perspective views of the housing 30, and FIGS. 6A to 6C are schematic cross-sectional views of the housing 30. With reference to FIG. 5A, the fiber connection portion 24 is inserted into the hole 32 of the housing 30 in a state where the receptacle 20 is disposed on the jig 10. With reference to FIG. 6A, the jig 10 is arranged so that the fulcrum part 16 that acts as a fulcrum when the jig 10 presses the receptacle 20 is fitted in the recess 36 of the housing 30. With reference to FIG. 6B, the engaging portion 14 of the jig 10 is fitted into the locking portion 34 of the housing 30. 5 (b) and 6 (c), since the jig 10 has a spring property, the protrusion 22 of the receptacle 20 is pressed by the pressing part 12 of the jig and is urged in the optical axis direction. (See the arrow in FIG. 6C).

As shown in FIG. 6C, the receptacle 20 is inserted into the opening 18 of the jig 10 (see FIG. 3A). Since the opening 18 is smaller than the projecting portion 22, when the pressing portion 12 presses the projecting portion 22 against the housing 30 by engaging the engaging portion 14 of the jig 10 with the engaging portion 34 of the housing 30, The receptacle 20 is fixed to the housing 30. As described above, the engaging portion 14 is locked to the housing 30 in a state where the jig 10 presses the protrusion 22 of the receptacle 20 against the housing 30. Thereby, the receptacle 20 can be easily attached to the housing 30 with the optical axes aligned.

  Further, by having the fulcrum portion 16 on one side of the jig 10 and the engaging portion 14 on the other side, the engaging portion 14 is locked to the housing 30 in a state where the jig 10 presses the protruding portion 22 against the housing 30. be able to.

  The casing 30 is provided with a hole 32 having a diameter smaller than that of the collar-shaped protrusion 22, and the protrusion 22 closes the hole 32 by pressing, so that the protrusion 22 blocks the hole 32 of the casing 30. Since it is completely closed, it is possible to prevent external high-frequency signals from leaking into the circuit board housing portion and preventing high-frequency signals generated within the circuit board housing portion from leaking outside.

  Further, the housing 30 and the receptacle 20 are electrically grounded to the outside by using a material made of a conductive metal (for example, the housing 30 is zinc die-cast and the receptacle 20 is stainless steel). It becomes a state. As a result, it is possible to suppress external high frequency signals from leaking into the circuit board housing portion 46 and leakage of high frequency signals generated within the circuit board housing portion 46 to the outside.

  Furthermore, it is preferable that at least a partial region of the housing 30 such as a portion that contacts the receptacle 20 is a metal. Thus, it is preferable that the surface of the receptacle 20 and the region where the receptacle 20 of the housing 30 is pressed are conductive. As a result, a part of the housing 30 and a portion where the receptacle 20 is in contact with each other are electrically grounded. Therefore, it is possible to suppress external high frequency signals from leaking into the circuit board housing portion 46 and leakage of high frequency signals generated within the circuit board housing portion 46 to the outside.

  Two (a plurality of) receptacles 20 arranged in the lateral direction are inserted into the jig 10, and the engaging portion 14 is provided in the longitudinal direction of the receptacle 20. Thus, the width of the housing 30 can be reduced by providing the engaging portions 14 not in the direction in which the receptacles 20 are arranged but in the intersecting direction.

  Example 2 is an example in which the pressing portion presses the protrusion via the spacer. FIG. 7A is a perspective view showing the receptacle 20 and the jig 10, and FIG. 7B is a schematic sectional view. A metallic spacer 50 is provided between the protrusion 22 of the receptacle 20 and the pressing portion 12 (see FIG. 3A) of the jig 10. As described above, the plate-like spacer 50 may be interposed between the jig 10 and the receptacle 20. In order for the jig 10 to obtain elasticity, the strength of the jig 10 decreases. According to the second embodiment, the pressing portion 12 presses the protruding portion 22 via the spacer 50, whereby the strength of the jig 10 can be reinforced.

  As for the structure of the jig, as shown in FIG. 8A, the opening 18a of the jig 10a may be opened in the vertical direction. As shown in the first embodiment and FIG. 8A, the jig 10 or 10a presses the plurality of receptacles 20, whereby the plurality of receptacles 20 can be fixed to the housing 30 at a time. As shown in FIG. 8B, the two receptacles 20 may be respectively fixed by two jigs 10b provided corresponding to each. Thereby, each jig | tool 10b can vary the pressure which presses the several receptacle 20, respectively. As described above, the structure of the jig is not limited to the embodiment.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to such specific embodiments, and various modifications and changes can be made within the scope of the gist of the present invention described in the claims. It can be changed.

FIG. 1 is a view showing a conventional receptacle fixing jig. FIG. 2A and FIG. 2B are perspective views of the optical communication module. FIG. 3A to FIG. 3C are perspective views of a jig and a receptacle. FIG. 4 is an exploded perspective view of the housing, the jig, and the receptacle. FIG. 5A and FIG. 5B are cutaway perspective views of the housing and the jig. Fig.6 (a) to FIG.6 (c) is a cross-sectional schematic diagram of a housing | casing and a jig. FIG. 7A and FIG. 7B are diagrams showing the second embodiment. Fig.8 (a) and FIG.8 (b) are another examples of a jig.

Explanation of symbols

10 Jig (pressing jig)
12 Press part 14 Engagement part (engagement opening part)
20 Receptacle 22 Protruding part 30 Housing 32 Hole 34 Locking part (Locking convex part)

Claims (5)

An optical element comprising a light- emitting element or a light-receiving element in an optical element housing part, a fiber connection part to which an optical fiber is connected, a protrusion, and a receptacle whose surface is conductive,
A housing that houses the receptacle and a circuit board that is electrically connected to an optical element in the receptacle, and has a hole having a diameter smaller than that of the protrusion, and is conductive;
An opening into which the receptacle is inserted smaller than the protrusion, an engagement part that engages with the locking part of the housing, and a fulcrum part that acts as a fulcrum when pressing the protrusion. A pressing jig having a spring property,
The space between the optical element storage portion and the protrusion is fitted into the opening of the pressing jig, the fulcrum portion of the pressing jig is fitted into the recess of the casing, and the fiber connection portion is a hole of the casing. The engaging portion of the pressing jig is locked to the locking portion of the casing while the peripheral portion of the opening of the pressing jig presses the protrusion against the casing in the state where the pressing jig is inserted. The optical communication module is characterized in that the projection portion completely closes the hole of the housing in a state where the receptacle is urged in the optical axis direction and the optical axis of the receptacle is aligned. .   The optical communication module according to claim 1, wherein a plurality of the receptacles are accommodated in the housing.   The optical communication module according to claim 2, wherein the pressing jig presses the plurality of receptacles.   The optical communication module according to claim 2, further comprising a plurality of the pressing jigs provided corresponding to each of the plurality of receptacles.   2. The optical communication module according to claim 1, wherein a plate-like spacer is interposed between the pressing jig and the protrusion of the receptacle.

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