JP2006251013A - Optical transmission connector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical transmission connector which is in simple structure and tolerant of noise. <P>SOLUTION: The optical transmission connector 1 is provided with a connection opening 13 into which an optical cable plug 2 including an optical fiber 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 31c and a light receiving element 32c respectively, at the opposite end, and the housing 10 is structured with covering outer peripheries of the transmission and reception modules housing sections 11 and 12 with an electromagnetic shield plate 20 where a ground terminal 21 is formed. <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 light receiving element incorporated therein, and a transmission and reception module incorporated therein.

FIG. 6 shows the structure of a conventional optical transmission connector.
A conventional optical transmission connector 100 is provided with a connection port 102 into which an optical cable plug (not shown) with an optical fiber is detachably inserted at one end of a housing 101, and a light emitting element and a light receiving element are respectively incorporated at the other end. The transmission / reception modules 103 and 104 are built in and covered with metal shield cases 105 and 105. In addition, the reception module 104 is separated from the transmission module 103 and shielded by another shield case 106 in order to prevent crosstalk with the transmission module 103 side.
Such shield cases 105 and 106 are provided to prevent electromagnetic interference, thereby preventing adverse effects and malfunctions due to external noise.

The following patent document discloses an optical element module using a shield case for preventing this type of electromagnetic interference.
JP-A-7-181352

However, since the conventional shield case is formed in a case shape as shown in FIG. 6 and the above-mentioned document, when it is formed from a plurality of sheet metal parts, a large number of parts and assembly cost are required. Necessary.
Further, in the case where the housing or the shield case is molded with a conductive resin, the cost of the conductive resin itself is increased, so that the entire manufacturing cost is increased, and the noise resistance is inferior to that of the sheet metal.

  The present invention has been proposed in view of the above circumstances, and an object of the present invention is to provide an optical transmission connector that has high noise resistance and has a simple structure and low manufacturing cost.

  In order to achieve the above object, the optical transmission connector according to claim 1 is provided with a connection port for detachably inserting an optical cable plug containing an optical fiber at one end of the housing, and at the opposite end, An optical transmission connector equipped with a transmitter and receiver module housing part, each of which incorporates a light emitting element and a light receiving element, and the housing forms a ground terminal around the outer periphery of the transmitter and receiver module housing part The structure is encapsulated with an electromagnetic shield plate.

  According to a second aspect of the present invention, the transmission / reception module housing portion is divided as a cut portion, and is configured as a hollow portion in which an opening portion is formed.

  According to a third aspect of the present invention, a pair of locking projections are formed on the side surface of the housing, and a fitting hole portion is formed in the electromagnetic shielding plate so as to correspond to the housing portion in the fitting hole portion. By fitting the locking protrusions, the electromagnetic shield plate is attached to the outer periphery of the transmitting / receiving module housing portion.

According to the optical transmission connector of the first aspect, since the transmission / reception module housing portion of the housing is structured to be encapsulated by the electromagnetic shield plate, it is not necessary to be housed in the shield case, and the structure is extremely simple. It can be shielded and has excellent noise resistance.
Further, since the electromagnetic shield plate can be integrally formed with a sheet metal including the ground terminal, the number of parts can be reduced. And by reducing the number of parts, cost can be reduced and mounting tact time can also be shortened.

  In particular, in claim 2, since the electromagnetic shield plate is inserted and inserted into the cut portion that partitions the transmission and reception module housing portions, crosstalk can be reduced with a very simple structure.

  According to a third aspect of the present invention, the electromagnetic shield plate is encased in the transmission / reception module housing portion of the housing by fitting the insertion hole portion of the electromagnetic shield plate into the pair of locking projections provided on the side surface of the housing. Because of the mounting structure, the electromagnetic shield plate can be easily and reliably assembled to the housing.

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

  FIG. 5 is a perspective view showing an example of use of the optical transmission connector of the present invention, particularly a connection mode with an optical cable plug.

  As shown in the figure, the optical transmission connector 1 is used by inserting an optical cable plug 2 in which an optical fiber is housed. The optical cable plug 2 has ferrules 2b and 2b with built-in optical fibers supported at the tip of the plug body 2a. The optical cable plug 2 is inserted into the connection port 13 of the optical transmission connector 1 and connected as shown in FIG. To do. In addition, 2c is a latching claw and 2d is a knob, and the connection holding and releasing operation of the optical cable plug 2 will be described later.

The optical transmission connector 1 has a housing 10 that is an outer shell of the connector 1 so that the optical cable plug 2 can be attached and detached. Transmitting and receiving module accommodating portions 11 and 12 that can accommodate modules (see 31 and 32 in FIG. 1 described later) are provided.
As will be described later, the transmission and reception module housing portions 11 and 12 are entirely encapsulated by an electromagnetic shield plate 20.

  1A and 1B are diagrams showing a configuration of an optical transmission connector according to the present invention. FIG. 1A is an overall perspective view, and FIG. 1B is an exploded perspective view.

  The optical transmission connector 1 includes a housing 10, an electromagnetic shield plate 20, a transmission module 31, a reception module 32, an input / output terminal 40, and the like.

  The housing 10 is formed of an insulating resin. As described above, the connection port 13 is provided at one end, and the transmission and reception module housing portions 11 and 12 are provided at the opposite end.

The transmission / reception module housing portions 11 and 12 are provided in the cavity portions 11b and 12b provided with openings 11a and 12a on one side, and further on the back thereof, for housing the light emitting and light receiving elements communicating with the connection port 13. The cylindrical hollow portions 11c and 12c (see FIG. 2 described later).
Each of the accommodating portions 11 and 12 has a structure in which partition walls 11d and 12d are formed on adjacent surfaces, and the housing portions 11 and 12 are separated from each other by a notched portion 14 formed in a gap shape. In addition, a pair of locking projections 15 and 15 are formed on the end surfaces of the transmission and reception module housing portions 11 and 12 constituting the side surface of the housing.

Further, the outer peripheral surfaces of the transmission / reception module housing portions 11 and 12 are formed one level lower than the outer peripheral surface on the connection port 13 side (about the thickness of the electromagnetic shield plate 20) in order to mount the electromagnetic shield plate 20.
The electromagnetic shield plate 20 is formed by bending a single sheet metal so that both ends are wound around the cut portions 14 of the housing 10 so as to enclose the transmission and reception module housing portions 11 and 12. Furthermore, ground terminals 21 and 21 are integrally formed on a part of the sheet metal 20. In addition, insertion holes 22 and 22 are formed at locations corresponding to the locking projections 15 and 15 of the housing 10, whereby the electromagnetic shield plate 20 can be attached and fixed simply by being inserted into the housing 10.

  The transmission module 31 includes a light emitting element block 31a and a circuit board 31b for electrically driving the light emitting element block 31a, and is accommodated in the transmission module accommodating portion 11. Similarly, the receiving module 32 includes a light receiving element block 32 a and a circuit board 32 b and is accommodated in the receiving module accommodating portion 12. The light emitting / receiving element blocks 31a and 32a are accommodated in the hollow portions 11b and 12b, and the circuit boards 31b and 32b are accommodated in the cylindrical hollow portions 11c and 12c.

  The light receiving element block 32a for reception has a lead frame 32d and is mounted with a light receiving element 32c provided with a condensing lens body for condensing light received from the optical fiber (see FIG. 2 described later). reference). Further, the reception circuit board 32b has an amplifier circuit IC 32e for amplifying the input signal from the light receiving element 32c, a noise cut capacitor, and the like mounted on the printed board.

  On the other hand, the light emitting element block 31a for transmission has a lead frame 31d and is mounted with a light emitting element 31c provided with a light irradiation lens body for generating parallel light at the tip (see FIG. 2). The transmission circuit board 31b is mounted with an IC 31e for driving the light emitting element 31c by an external electric signal.

  Further, a plurality of input / output terminals 40, 40... Are connected to the circuit boards 31b, 32b by soldering. The input / output terminals 40, 40... Protrude from the substrates 31b, 32b substantially parallel to the bottom surfaces of the cavities 11b, 12b, outward from the openings 11a, 12a, and bend at a substantially right angle. And it extends downward. The plurality of connection terminals 40, 40... Are connected to a common lead (not shown) and are integrally formed, and the common lead is cut off and used.

  The optical transmission connector 1 has an electromagnetic shield plate 20 mounted on the outside of the transmission / reception module housing parts 11, 12 of the housing 10, and the input / output terminals 40, 40. ······································································································· Formed as.

  FIG. 2 shows a cross-sectional view of the optical transmission connector 1. As shown in the figure, the notch 14 is inserted with the side end pieces wound around the transmitting and receiving module accommodating portions 11 and 12 of the electromagnetic shield plate 20 in a superposed state, and the locking projections 15 and 15 formed on the side surfaces. The housing 10 and the electromagnetic shield plate 20 are fixed by fitting the fitting hole portions 22 and 22 into the housing.

  In addition, the broken line in a figure has shown the optical cable plug 2, and 2b and 2b shown with the dashed-two dotted line have shown a pair of ferrule. Reference numerals 16 and 16 denote sleeves into which the ferrules 2b and 2b are inserted. The optical cable plug 2 is inserted into the connection port 13 in a state where the knob 2d is pressed and the latching claws 2c are spread on both sides. When the press is released, the claws 2c are latched by the jaw insertion grooves 13a by the urging force. Then, the ferrules 2b and 2b are fixed so as not to come off (see FIG. 5).

  In the configuration as described above, since the shield member for preventing electromagnetic interference is formed by the electromagnetic shield plate 20 made of one sheet metal, the number of parts can be reduced and the cost can be reduced. Tact can also be shortened. Of course, since the electromagnetic shielding plate 20 encapsulates the entire housing portion, it is possible to effectively block external noise.

  Furthermore, since a cut portion 14 is provided between the transmission and reception module accommodating portions 11 and 12, and the side end face of the electromagnetic shield plate 20 is wound and accommodated therein, the cross-section is extremely simple, Talk can be effectively reduced. That is, the reception module 32 prevents the influence of the high frequency generated from the transmission module 31 by the partial piece of the electromagnetic shield plate 20 inserted into the cut portion 14.

  FIG. 3 is a development view of the electromagnetic shield plate 20. The dotted line in the figure indicates the folding allowance.

The electromagnetic shield plate 20 is formed of a single sheet metal to enclose the transmission and reception module housing portions 11 and 12. That is, the partition portion 26, the lower surface portion 25, the side surface portion 24, the upper surface portion 23, the side surface portion 24, the lower surface portion 25, and the partition portion 26 forming the insertion holes 22 are continuously formed. Has been.
In addition, notches 21a and 21a are formed in the portions continuing from the side surface portions 24 and 24 to the lower surface portions 25 and 25, and the ground terminals 21 and 21 are integrally formed. The inserts 21a and 21a are bent and used as shown in FIG.

When such a single sheet metal is bent along a dotted line, as shown in FIG. 1, each of the transmission and reception module housing portions 11 and 12 is surrounded and the partition portions 26 and 26 are overlapped with each other. , 21 are connected and mounted on a circuit board (not shown) by soldering or the like in the same manner as the connection terminal 40 protruding from the transmission / reception module housing parts 11, 12.
In addition, although the insertion piece with respect to the notch | incision part 14 is made double in a present Example, you may form the electromagnetic shielding board 20 so that only one piece may be inserted in the electromagnetic shielding board 20. FIG.

Further, insertion holes 22 and 22 are formed in the side surface portions 25 and 25, respectively, and the insertion holes 22 and 22 are fitted with the locking projections 15 and 15 of the housing 10. FIG. 4 shows a partially enlarged cross-sectional view of the fitting and coupling portion. FIG. 4A shows a state before the electromagnetic shield plate 20 is attached, and FIG. 4B shows a state after the attachment.
The locking projection 15 provided on the housing 10 is formed so as to be fitted and fixed to the insertion hole 22 formed in the electromagnetic shield plate 20, but the electromagnetic shielding plate 10 of the locking projection 15 is inserted. An inclined guiding portion 15a is formed at the end on the side so that the electromagnetic shield plate 20 can be easily fitted, and after being fitted, it falls into the groove 15b and cannot be easily removed.

(A) is a whole perspective view of the optical transmission connector of the present invention, (b) is an exploded perspective view. FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1 of the optical transmission connector of the present invention. It is an expanded view of an electromagnetic shielding board. It is explanatory drawing of the fitting coupling structure of a housing and an electromagnetic shielding board, (a) is before mounting | wearing of an electromagnetic shielding board, (b) has shown after mounting | wearing. It is a perspective view which shows the usage condition with the optical cable plug of the optical transmission connector of this invention. It is the figure which showed the shield structure of the conventional optical transmission connector.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical transmission connector 2 Optical cable plug 10 Housing 11 Transmission module accommodating part 11a Opening part 11b Cavity part 11c Cylindrical cavity part 12 Reception module accommodating part 12a Opening part 12b Cavity chamber 12c Cylindrical cavity part 13 Connection port 14 Cut part 15 Engagement Stop projection 16 Sleeve 20 Electromagnetic shield plate 21 Ground terminal 22 Fitting hole 31 Transmission module 31c Light emitting element 32 Reception module 32c Light receiving element

Claims (3)

One end of the housing is provided with a connection port for detachably inserting an optical cable plug with an optical fiber installed therein, and at the opposite end, a transmitter incorporating a light emitting element and a light receiving element, and a transmitter incorporating a receiving module, An optical transmission connector having a receiving module housing part,
An optical transmission connector in which the housing has a structure in which an outer periphery of the transmission / reception module housing portion is encapsulated with an electromagnetic shield plate having a ground terminal. In claim 1,
The optical transmission connector, wherein the transmission / reception module housing part is configured as a hollow part which is divided by a notch part and each has an opening. In claim 1 or 2,
A pair of locking projections are formed on the side surface of the housing, and a fitting hole is formed in the electromagnetic shield plate correspondingly.
The electromagnetic shield plate has a structure in which the electromagnetic shield plate is attached to the outer periphery of the transmission / reception module housing portion by fitting the locking projection of the housing into the fitting hole portion. Transmission connector.

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