JP2006251014A - Optical transmission connector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical transmission connector such that connection terminals of transmission and reception modules incorporated in a connector are accurately disposed and projected from a housing. <P>SOLUTION: The optical transmission connector 1 is provided with a connection opening 13 into which an optical cable plug 2 is detachably inserted at one end of a housing 10, and transmission and reception module housing sections 11 and 12, having transmission and reception modules 31 and 32 including a light emitting element and a light receiving element respectively, at the opposite end, and the transmission and reception modules 31 and 32 have connection terminals 40 projected extending to outside and below the housing 10 from opening portions 11a and 12a of the transmission and reception module housing portions 11 and 12, and also have cut grooves 10a in which the connection terminals 40 are fitted at lower edges of opening edges of the opening portions 11a and 12a. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an improvement in an optical transmission connector having a light emitting element and a transmission / reception module having a light receiving element.

  This type of optical transmission connector is widely known to have a structure in which a transmission / reception module installed in a housing is covered with a metal shield member such as a shield case so that the transmission / reception module is not affected by noise.

The following document describes a circuit board covered with a shield case.
JP-A-9-153696

  By the way, in this type of optical transmission connector, when the connector body is mounted on the circuit board, the connection terminals housed in the housing and protruding from the receiving module in a leg shape are soldered and mounted on the circuit board. However, in these cases, since the connection terminals are leg-shaped, when the inside of the housing is resin-sealed with the connection terminals protruding to the outside, the connection terminals are displaced, When soldered and mounted on the circuit board in such a state, there may be a problem that the shield member of the connector is short-circuited with a conductive portion such as a circuit pattern of the circuit board.

  The present invention has been proposed in view of such circumstances, and a main object of the present invention is to provide an optical transmission connector that can project a connection terminal in a state of being accurately positioned with respect to a housing.

  Another object is to provide an optical transmission connector in which a shield member is considered not to come into contact with a conductive portion on a circuit board when or when it is mounted on a circuit board.

  In order to achieve the above object, in the optical transmission connector according to claim 1, a connection port for detachably inserting an optical cable plug from which an optical fiber is led is provided at one end of the housing, and at the opposite end. In the optical transmission connector provided with a transmission and reception module housing part that houses a transmission and reception module each incorporating a light emitting element and a light receiving element, the transmission and reception modules are connected to the outside of the housing through the openings of the transmission and reception module housing parts. The connection terminal extending in the direction protrudes, and a notch groove into which the connection terminal is fitted is formed at the lower edge of the opening of the transmission / reception module housing.

  According to a second aspect of the present invention, in the first aspect, the connection terminal has a structure in which a guide protrusion is formed along the upper edge of the notch groove in the opening of the transmission / reception module housing.

  A third aspect of the present invention is the transmission or reception module housing portion according to the first or second aspect, wherein the outer periphery of the transmission / reception module housing portion is encapsulated by an electromagnetic shield plate integrally formed with a ground terminal, and the housing is a portion provided with a connection port. When the mounting is performed such that the bottom surface of the housing is mounted on the circuit board, the bottom surface of the portion encapsulated by the electromagnetic shield plate is formed on the bottom surface of the housing so that a gap is formed between the bottom surface and the circuit board. It is characterized by forming a stepped portion.

  According to a fourth aspect of the present invention, in the third aspect of the present invention, the connection terminal is a spacer for lifting and supporting the bottom surface of the transmission / reception module housing portion from the circuit board at a portion protruding downward from the opening of the transmission / reception module housing portion. A protrusion is further formed, and the housing is structured to be supported on the circuit board without inclination by the spacer protrusion and the bottom surface of the housing portion provided with the connection port.

  According to the optical transmission connector of claim 1, since the notch groove for fitting the connection terminal is formed in the opening edge of the transmission and reception module housing portion of the housing, when housing the transmission / reception module in the housing portion, The connecting terminal can be accurately positioned and projected. Thereby, a connector main body can be mounted in a proper state on a circuit board.

In claim 2, since the connection terminal forms a guide protrusion along the upper edge of the notch groove, if the guide protrusion is fitted in the notch groove along the upper edge of the notch groove of the opening, The connecting terminal can be accurately positioned and protruded, and the fitting operation into the notch groove is facilitated.
This is particularly advantageous when there are a plurality of connection terminals, and the connection terminals can be protruded from the housing of the connector in a properly aligned state.

  In claim 3, when the housing is mounted on the circuit board so that the part provided with the connection port is placed between the bottom surface of the part encapsulated by the electromagnetic shield plate and the circuit board. Since a step is formed on the bottom surface of the housing so that a gap is formed, when the connector is mounted on the circuit board, the electromagnetic shield plate contacts the conductive part on the circuit board and shorts the conductive part. This can be prevented.

  According to a fourth aspect of the present invention, the connection terminal is further formed with a spacer protrusion for lifting and supporting the bottom surface of the accommodating portion at a portion protruding from the lower edge of the opening of the transmitting and receiving module accommodating portion. In the transmission connector, the housing is lifted and supported by the spacer protrusion and the bottom surface of the housing portion provided with the connection port, and can be mounted in a correct state without causing an inclination on the circuit board.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

1A to 1C show an embodiment of the optical transmission connector of the present invention.
Referring to these drawings, the optical transmission connector 1 includes a housing 10, an electromagnetic shield plate 20, a transmission module 31, a reception module 32, a connection terminal 40, and the like.

  Here, the housing 10 is molded of an insulating resin, and a connection port 13 for inserting and removing an optical cable plug 2 described later is provided at one end, and transmission and reception module housing portions 11 and 12 are provided at the opposite end. The outer periphery thereof is encapsulated with an electromagnetic shield plate 20.

  The transmission / reception module housing portions 11 and 12 are provided with a hollow housing chamber formed with openings 11a and 12a on one side, and a sleeve (in FIG. 2B, only the receiving module side is indicated by 12b in the back thereof. ) And are connected to the connection port 13 side, and have partition walls 11d and 12d separated from each other by the cut portion 14, and a pair of locking projections 15 and 15 are provided on both outer wall surfaces. Forming.

The electromagnetic shield plate 20 is formed by bending one sheet metal, and the both end pieces of the electromagnetic shield plate 20 are wound in a state of being overlapped with the above-described cut portion 14 so that the outer periphery of the transmission and reception module housing portions 11 and 12 is covered. Further, a pair of ground terminals 21, 21 are projected from the bottom side of the housing 10.
Further, insertion holes 22 and 22 are formed at locations corresponding to the locking projections 15 and 15 of the housing 10, so that the housing 10 can be mounted and fixed.

  The transmission module 31 has a built-in LED and is provided with a lens portion at the tip for generating a parallel light bundle, a light-emitting element block 31a according to an external electric signal, and a circuit board 31b for driving the light-emitting element block 31a. Thus, the connection terminal 40 connected to the circuit board 31 b is accommodated in the transmission module accommodating portion 11 in a state of projecting outward and downward from the housing 10, and sealed with a heat-resistant insulating resin 33.

  The receiving module 32 includes a photodiode 32c, a light receiving element block 32a provided with a condensing lens 32d, an amplification circuit for amplifying an input signal from the light receiving element block 32a, a signal processing capacitor, and the like. In the same manner as the transmission module 31, the connection terminal 40 connected to the circuit board 32 b protrudes outward and downward from the housing 10, so that the reception module housing portion 12 has the circuit board 32 b mounted thereon. It is accommodated and sealed with a heat-resistant insulating resin 33 (see FIGS. 1C and 2C for the above).

  Further, the plurality of connection terminals 40, 40... Projecting from the circuit boards 31b, 32b project substantially parallel to the bottom surfaces of the housing parts 11, 12, and bend at substantially right angles from the openings 11a, 12a. It extends downward. Such connection terminals 40, 40... Are cut off after connecting a plurality of integrally formed common leads (not shown) to the circuit boards 31b, 32b.

Further, as shown in FIG. 1B, a plurality of cutout grooves 10a, 10a,... Are formed on the lower edges of the openings 11a, 12a of the transmission / reception module housing parts 11, 12. 10a, 10a,... Have a groove width corresponding to the width dimension of the connection terminals 40, 40.
For this reason, when the transmission / reception modules 31 and 32 are accommodated in the respective accommodating portions 11 and 12, by inserting the connection terminals 40, 40... Into the above-described cutout grooves 10a, 10a. It can be made to project correctly and aligned from the openings 11a and 12a of the accommodating portions 11 and 12, and at this time, it is fixed from both sides by the notch groove 10a. Can be structured.

  FIG. 2 shows an embodiment in which a guide protrusion is provided on a connection terminal protruding from a circuit board of a transmission / reception module.

If each of the connection terminals 40... Is provided with such guide protrusions 41..., When the circuit boards 31 b and 32 b are accommodated in the transmission and reception module accommodating portions 11 and 12, FIG. As shown in b), each of the guide protrusions 41 is fitted along the upper edge 10b of the notch groove 10a, so that the connection terminal 40 is guided and fixed at the correct position. Therefore, it is possible to facilitate the interior work of the receiving and receiving modules 31 and 32 in the accommodating portions 11 and 12.
Moreover, since the connection terminal 40 is fixed from both sides in such a notch groove 10a, it has the effect of increasing the strength against lateral stress.

Furthermore, in the connector of the present invention of the embodiment shown in FIGS. 2A to 2C, the outer peripheral wall on the side of the transmission / reception module becomes small between the connection port 13 portion and the transmission / reception module housing parts 11 and 12. Upper and lower steps 16, 16a are formed.
These steps are such that the bottom side 16a of the housing 10 falls more greatly than the top side 16 so that when the magnetic shield plate 20 is put on the transmission / reception module housing portions 11 and 12, the housing 10 While the upper surface side is substantially flush with the connection port 13 portion, a gap S is formed between the electromagnetic shield plate 20 and the bottom surface of the connection port 13 portion of the housing 10.

  Such a gap S formed on the bottom surface side of the housing 10 prevents the circuit board 50 and the electromagnetic shield plate 20 from coming into direct contact when the housing 10 is placed on the circuit board (see FIG. 3). It is possible to effectively prevent the electromagnetic shield plate 20 from coming into contact with a conductive portion (not shown) on the circuit board 50 to short-circuit the conductive portion. 2A shows a rear view of the state before the sealing resin is sealed in the sending / receiving module housing portion, and FIG. 2C shows a longitudinal section after the sealing resin 33 is sealed. The surface structure is shown.

  FIG. 3 shows an embodiment in which a spacer protrusion is provided in addition to the guide protrusion on the connection terminal.

In this example, the connection terminal 40 forms a spacer protrusion 42 below the guide protrusion 41, and a portion between the guide protrusion 41 and the spacer protrusion 42 is sent and received. 12 is inserted into a notch groove 10a formed at the lower edge of the openings 11a and 12a, and the spacer protrusion 42 protrudes further downward from the openings 11a and 12a and is soldered to the circuit board 50 below the spacer protrusion 42. The leg part 43 is extended.
Here, the spacer protrusion 42 is formed so that the height in the vertical direction matches the bottom surface of the connection port 13 portion.
Therefore, with such a structure, when the connection terminal 40 protruding from the housing 10 and the legs of the ground terminal 21 are mounted on the circuit board 50 by soldering or the like, the bottom surface of the connection port 13 portion of the housing 10 is mounted. Is in contact with the upper surface of the circuit board 50, but the bottom surfaces of the transmission / reception module housing parts 11, 12 can be lifted and supported by the spacer protrusions 42 of the connection terminals 40, so that the housing 10 has the connection port 13 portion and the transmission / reception module housing part 11. , 12 can be held at the same height, and mounted on the circuit board 50 without tilting.

  3 (a) and 3 (b) show the state when mounted on a circuit board. As shown in FIG. 3 (b), the bottom surfaces of the sending and receiving module accommodating portions 11 and 12 are connected. When lifted and supported by the spacer protrusion 42 of the terminal 40, a gap S is formed between the electromagnetic shield plate 20 that covers the outer periphery of the sending and receiving module housing portions 11 and 12 and the circuit board 50. Accordingly, it is possible to prevent the electromagnetic shield plate 20 from inadvertently contacting the conductive portion on the circuit board 50 and short-circuiting the conductive portion. 3A shows a rear view of the state before the sealing resin is sealed in the sending / receiving module housing portion, and FIG. 3B is a longitudinal section after the sealing resin is sealed. The structure is shown.

  FIG. 4 is a perspective view showing a connection mode of the optical transmission connector of the present invention with an optical cable plug.

  As shown in the figure, the optical transmission connector 1 of the present invention is used by inserting and attaching an optical cable plug 2 from which optical fibers 21 and 22 are led out. The optical cable plug 2 can be coupled by inserting ferrules 2b and 2b protruding from the tip of the plug body 2a into a sleeve provided in the connection port 13 of the optical transmission connector 1, and connecting the plug body 2a. If it is inserted into the opening 13, a latch claw (not shown) provided on the plug body 2 a side is engaged and held in the connection opening 13, and if the release buttons 2 c provided on both sides of the plug body 2 a are pressed, The engagement by the latch claw is released so that it can be extracted from the connection port 13.

(A) is the whole perspective view of the optical transmission connector of this invention, (b) is a figure which shows the notch groove formed in the opening part of a transmission / reception module accommodating part, (c) is a disassembled perspective view of an optical transmission connector. (A) is a rear view of the optical transmission connector of the present invention, (b) is a partially enlarged explanatory view showing a guide protrusion of a connection terminal, and (c) is a longitudinal sectional view of the optical transmission connector. (A) is a rear view at the time of mounting the optical transmission connector of this invention on a circuit board, (b) is the longitudinal cross-sectional view. It is a figure which shows the use condition of the optical transmission connector of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical transmission connector 2 Optical cable plug 10 Housing 10a Notch groove 11 Transmission module accommodating part 11a Opening part 12 Receiving module accommodating part 12a Opening part 13 Connection port 16, 16a Step part 20 Electromagnetic shielding board 31 Transmitting module 32 Receiving module 40 Connecting terminal 41 Guide protrusion 42 Spacer protrusion 50 Circuit board S Air gap

Claims (4)

One end of the housing is provided with a connection port for detachably inserting an optical cable plug from which an optical fiber is led out, and at the opposite end, a transmission incorporating a light emitting element and a light receiving element, and a transmission incorporating a receiving module, In the optical transmission connector provided with the receiving module housing part,
The transmission / reception module projects a connection terminal extending outward and downward from a housing through an opening provided in the transmission / reception module housing portion, and at a lower edge of the opening of the transmission / reception module housing portion. The optical transmission connector in which the notch groove which inserts the said connection terminal is formed. In claim 1,
The optical transmission connector, wherein the connection terminal has a structure in which a guide protrusion is formed along an upper edge of the cutout groove of the transmission / reception module housing portion. In claim 1 or 2,
The transmission and reception module housing part is encapsulated in the outer periphery by an electromagnetic shield plate integrally formed with a ground terminal,
A step portion is formed on the bottom surface of the housing, and the housing is encapsulated with the electromagnetic shield plate when mounted on the circuit board with the bottom surface of the portion provided with the connection port. An optical transmission connector characterized in that a gap is formed between a bottom surface of the portion and the circuit board. In claim 3,
The connection terminal further forms a spacer projection for lifting and supporting the bottom surface of the transmission / reception module housing portion from the circuit board at a portion projecting downward from the opening of the transmission / reception module housing portion. And
The optical transmission connector, wherein the housing has a structure in which the spacer protrusion and the bottom surface of the housing portion provided with the connection port are supported on the circuit board without inclination.

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