JP2010211030A - Optical connector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stabilize relative positional relation between a photoelectric conversion element and an optical fiber by reducing variation of mounting positions of the photoelectric conversion element to suppress increase in connection loss of a signal on an engagement surface of the optical connector. <P>SOLUTION: In the optical connector 1 consisting of: a first connector 10 to which an optical cable 90 having optical fibers 90a, 90b is attached; and a second connector 20 which is attachably/detachably engaged into the first connector 10, and to which photoelectric conversion elements 92a, 92b for performing photoelectric conversion between an optical signal to be transmitted by the optical fibers 90a, 90b and an electric signal are attached, an element attachment part 24 is formed which has openings 241a, 241b opened toward a direction perpendicular to the direction in which the first connector 10 engages with the second connector 20, and specification parts 242a, 242b which specify motions of the photoelectric conversion elements 92a, 92b attached from the openings 241a, 241b to the element attachment part 24 are provided in the element attachment part 24. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an optical connector, and more particularly, to an optical connector used when connecting an optical fiber and a photoelectric conversion element that performs photoelectric conversion between an optical signal transmitted through the optical fiber and an electric signal. Is.

  In general, an optical cable using an optical fiber (also referred to as an optical fiber cable) is widely used for home and industrial information communication because it enables high-speed communication of a large amount of information. In addition, for example, automobiles are equipped with various electrical components (for example, a car navigation system), and are often used for optical communication of these electrical components. Various optical connectors have been proposed for use in connecting this optical fiber to a photoelectric conversion element that converts an optical signal into an electrical signal or converts an electrical signal into an optical signal.

  As a prior art of this type of optical connector, for example, a configuration as shown in Patent Document 1 is known. The optical connector (hybrid connector) described in Patent Document 1 has a configuration in which a photoelectric conversion element (optical element module) is attached to a receiving cylinder formed in one connector housing via a sleeve. Thereby, the position shift etc. of the photoelectric conversion element with which the connector was mounted | worn is prevented, and the loss of the transmitted signal can be reduced.

JP 2002-82258 A

  However, in the case of a structure in which the photoelectric conversion element is fixed via another member such as a sleeve as in the optical connector described in Patent Document 1, manufacturing errors of the connector housing and the sleeve accumulate, There has been a problem that the mounting position, particularly the mounting position of the photoelectric conversion element with respect to the optical fiber in the connector fitting direction (signal transmission direction) is greatly displaced. In addition, when a device using such an optical connector is mounted on a vehicle, there is a problem that the relative position between the optical fiber and the photoelectric conversion element is easily disturbed under the use environment in which vibration is applied. For these reasons, in the conventional optical connector, there is a risk that the signal loss (loss during photoelectric conversion) on the fitting surface of the optical connector increases.

  A problem to be solved by the present invention is a first connector to which an optical cable is attached, and a photoelectric conversion element that converts an optical signal transmitted to an optical fiber included in the optical cable into an electrical signal or an electrical signal into an optical signal. In the optical connector composed of the second connector to which the first connector is mounted, by reducing the variation in the mounting position of the photoelectric conversion element with respect to the second connector, It is an object of the present invention to provide an optical connector that stabilizes the relative positional relationship of the optical connector and suppresses an increase in signal connection loss on the fitting surface of the optical connector.

  In order to solve the above problems, an optical connector according to the present invention is a first connector to which an optical cable having an optical fiber is attached, and is detachably fitted to the first connector and transmitted to the optical fiber. Consists of a second connector to which a photoelectric conversion element that performs photoelectric conversion between an optical signal and an electrical signal is attached, and the first connector and the second connector are fitted to the second connector An element mounting portion having an opening that is open in a direction substantially orthogonal to the direction to be formed is formed, and movement of the photoelectric conversion element mounted on the element mounting portion from the opening is formed in the element mounting portion. The gist of the invention is that a restricting section for restricting the above is provided.

  In this case, at least one convex portion or concave portion is formed in the photoelectric conversion element, and the restricting portion provided in the element mounting portion is formed to engage with the convex portion or concave portion of the photoelectric conversion element. It is desirable to be a concave or convex portion.

  In the first connector, it is preferable that the ferrule into which the end portion of the optical fiber is inserted is surrounded by a hood portion so that a front end side end surface does not protrude outward.

  Furthermore, when the first connector and the second connector are fitted, the opening of the element mounting portion is configured to be partially or entirely shielded by the hood portion. Even better.

  In the optical connector according to the present invention, one connector (second connector) is provided with an opening for inserting the photoelectric conversion element in a direction orthogonal to the fitting direction of the connector, and performs photoelectric conversion of the signal. Is configured to be directly attached to the connector, and the movement of the photoelectric conversion element attached from the opening is restricted by the restricting portion, so that it is attached to the second connector and its connector due to manufacturing errors, etc. Variation in the positional relationship with the photoelectric conversion element can be reduced (the mounting accuracy of the photoelectric conversion element can be increased). In other words, the positional relationship between the optical fiber and the photoelectric conversion element attached to the other connector (first connector), particularly the positional relationship between the two in the connector fitting direction, is stable. Loss amount can be kept small.

  In this case, as the restricting portion, one or more convex portions or convex portions formed on the photoelectric conversion element are provided in the element mounting portion so as to be engaged with one or more convex portions or concave portions. The mounting accuracy of the photoelectric conversion element with respect to the connector can be increased, and the positional relationship between the optical fiber and the photoelectric conversion element, particularly the positional relationship between both in the fitting direction of the connector can be stabilized.

  And, by providing the hood portion so as to surround the ferrule protruding from the front end side end surface of the first connector, in a state where the first connector is not fitted to the second connector (non-fitted state), The ferrule is protected by the hood. As a result, it is possible to prevent the occurrence of defects such as contamination on the ferrule or damage to the ferrule (particularly, the defect on the tip surface of the ferrule that becomes the abutting surface with the photoelectric conversion element).

  The first connector to which the optical cable is attached is provided with the hood as described above, and an opening for attaching the photoelectric conversion element to the element attachment portion when the first connector and the second connector are fitted. If the part is configured to be partially or entirely shielded by the hood part, it is possible to prevent the photoelectric conversion element from falling off from the element mounting part and foreign matter entering the element mounting part. it can.

  In other words, the hood portion serves as a protective portion that protects the ferrule when the first connector and the second connector are in a non-fitted state, while the first connector and the second connector are fitted. When in a state, an opening is provided so that the photoelectric conversion element attached to the element attachment part does not fall off from the above-mentioned opening part that opens in a direction substantially orthogonal to the fitting direction, and foreign matter does not enter the element attachment part. It plays the role which shields a part.

It is sectional drawing of the optical connector (fitting state) which concerns on one Embodiment of this invention, FIG. 1 (a) is a longitudinal cross-sectional view (BB sectional drawing in FIG.1 (b)), FIG.1 (b). Is a cross-sectional view (a cross-sectional view taken along line AA in FIG. 1A). 2A is an external perspective view of the optical cable connector shown in FIG. 1, FIG. 2A is an external perspective view seen from above, and FIG. 2B is an external perspective view seen from below. It is a disassembled perspective view of the male connector which comprises the optical connector shown in FIG. 1 and FIG. It is a disassembled perspective view of the female connector which comprises the optical connector shown in FIG. 1 and FIG. It is the figure which showed a mode that a photoelectric conversion element and a control board were attached to the housing main body of the female connector shown in FIG.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. Here, FIG. 1 shows a fitting state of a first connector (referred to as a male connector 10 in this embodiment) and a second connector (referred to as a female connector 20 in this embodiment) in the present invention. 1A is a longitudinal sectional view (a sectional view taken along line BB in FIG. 1B), and FIG. 1B is a lateral sectional view (AA in FIG. 1A). FIG. 2 is an external perspective view of the optical connector 1, FIG. 2 (a) is an external perspective view seen from above, and FIG. 2 (b) is an external perspective view seen from below. 3 is an exploded perspective view of the male connector 10 constituting the optical connector 1, and FIG. 4 is an exploded perspective view of the female connector 20 similarly constituting the optical connector 1. FIG.

  In the following description, in the male connector 10, the side to be fitted with the female connector 20 is referred to as a distal end side, and the opposite direction is referred to as a proximal end side. Similarly, in the female connector 20, the side to be fitted with the male connector 10 is referred to as a distal end side, and the opposite direction is referred to as a proximal end side.

  As shown in FIGS. 1 and 2, the optical connector 1 according to this embodiment includes a male connector 10 and a female connector 20. As will be described in detail later, an optical cable 90 is attached to the male connector 10, and the female connector 20 includes a photoelectric conversion element 92a that converts an optical signal into an electrical signal, and a photoelectric converter that converts the electrical signal into an optical signal. A conversion element 92b is attached.

  The optical cable 90 used in this embodiment is a two-core type having two optical fibers 90a and 90b for transmission and reception for transmitting an optical signal. As the optical fibers 90a and 90b, those made of glass-based materials or synthetic resin-based materials are known. The optical fibers 90a and 90b can be distinguished for transmission and reception by a colorant applied on the surface. The optical fibers 90 a and 90 b are optically connected to the photoelectric conversion elements 92 a and 92 b by fitting the male connector 10 and the female connector 20.

  As shown in FIG. 2 (a), in these optical cables 90, the two optical fibers 90a and 90b are disposed at the center of the cross section, and the periphery thereof is covered with a synthetic resin sheath material 903. Become. The cross-sectional shape of the optical cable 90 is formed, for example, in a substantially rectangular cross-section, and two tension members (in the optical cable 90 near the left and right sides of the optical fibers 90a and 90b) that increase the mechanical strength of the optical cables 90a and 90b ( Tensile wire) 904 is disposed in the core wire direction of the optical fibers 90a and 90b.

  The male connector 10 is a connector to which ferrules 93a and 93b to which end portions of the optical fibers 90a and 90b are fixed are attached. In the present embodiment, the first connector housing 12 and the second connector housing 14 are connected to each other. Combined. Hereinafter, the configuration of the male connector 10 will be described together with the method for attaching the optical cable 90 to the male connector 10.

  As shown in FIGS. 1 to 3, the first connector housing 12 is a connector housing on the side (base end side) into which the optical cable 90 is inserted. The first connector housing 12 includes an optical cable insertion hole 121 formed on the most proximal side, fiber insertion holes 122a and 122b communicating with the optical cable insertion hole 121, and cylindrical portions 123a and 123b protruding from the distal end surface. The spring housing holes 124a and 124b are formed inside the cylindrical portions 123a and 123b and communicate with the fiber insertion holes 122a and 122b, and the locking portions 125 are formed in the blade-like portions protruding from the outer peripheral surface. .

  The optical cable 90 is inserted into the optical cable insertion hole 121 in a state where the sheath material 903 and the tension member 904 having a predetermined length are cut from the tip, and the optical fibers 90a and 90b are exposed. The optical cable insertion hole 121 communicates with the fiber insertion holes 122a and 122b. The optical fiber 90a is inserted into the fiber insertion hole 122a, and the optical fiber 90b is inserted into the fiber insertion hole 122b. The fiber insertion holes 122a and 122b communicate with spring accommodating holes 124a and 124b formed inside the cylindrical portions 123a and 123b, respectively. The optical fibers 90a and 90b pass through the spring accommodating holes 124a and 124b, respectively. The first connector housing 12 is projected from the end surface on the front end side.

  In this state, ferrule biasing springs 94a and 94b are inserted into the optical fibers 90a and 90b, respectively. The ferrule biasing springs 94a and 94b are received in the spring accommodating holes 124a and 124b. In addition, projections 126a and 126b projecting radially outward are formed on the outer peripheral surfaces of the cylindrical portions 123a and 123b.

  Thereafter, the tip portions of the optical fibers 90a and 90b are inserted into fiber mounting holes (not shown) formed in the ferrules 93a and 93b, and are fixed to the ferrules 93a and 93b with an adhesive or the like. As shown in FIG. 1, the ferrules 93a and 93b are formed in a shape having a stepped portion such that the distal end side becomes thinner than the proximal end side. After the optical fibers 90a and 90b are fixed to the ferrules 93a and 93b, in order to reduce the connection loss at the time of photoelectric conversion, the front end side end surfaces of the ferrules 93a and 93b (abutting surfaces with the photoelectric conversion elements 92a and 92b) A mirror finish is applied.

  As shown in FIGS. 1 to 3, the second connector housing 14 has a ferrule housing hole 141 a, 141 b, recesses 142 a, 142 b communicating with the ferrule housing hole 141 a, 141 b, and a cantilever shape from the outer peripheral surface. The formed locking piece 145 and a hood portion 146 formed so as to protrude from the distal end side end surface 15 are provided.

  The ferrule housing holes 141a and 141b are holes for housing ferrules 93a and 93b to which the tip portions of the optical fibers 90a and 90b are fixed. Like the ferrules 93a and 93b, the ferrule housing holes 141a and 141b are formed in a shape having a step portion that is thinner on the distal end side than on the proximal end side. That is, by making the ferrules 93a and 93b and the ferrule accommodation holes 141a and 141b into such a shape, the ferrules 93a and 93b inserted from the base end side of the ferrule accommodation holes 141a and 141b are formed in the ferrule accommodation holes 141a and 141b. Omission from the tip side is prevented. The ferrules 93a and 93b and the ferrule accommodation holes 141a and 141b are formed such that at least a part of the cross section thereof is a non-circular shape such as a hexagonal shape. Thereby, the movement of the ferrule 93a, 93b accommodated in the ferrule accommodation hole 141a, 141b is regulated.

  Moreover, as shown in FIG.1 (b), the locking holes 143a and 143b are formed in the internal peripheral surface of the hollow parts 142a and 142b.

  The first connector housing 12 and the second connector housing 14 are engaged with each other in a state where the ferrules 93a and 93b in which the tip portions of the optical fibers 90a and 90b are fixed are received in the ferrule receiving holes 141a and 141b. Specifically, the cylindrical portions 123a and 123b of the first connector housing 12 are inserted into the recessed portions 142a and 142b of the second connector housing 14, and the protrusions 126a and 126b are locked to the locking holes 143a and 143b. . At the same time, the locking piece 145 formed to be elastically deformable is locked so that the locking protrusion 145a at the tip of the locking piece 145 is hooked on the locking portion 125. Thereby, the first connector housing 12 and the second connector housing 14 are integrated to form the male connector 10.

  Further, when the first connector housing 12 and the second connector housing 14 are integrated, the ferrule biasing springs 94a and 94b are connected to the base end side end surfaces of the ferrules 93a and 93b and the bottom surfaces of the spring accommodating holes 124a and 124b. To be compressed. Thus, the ferrules 93a and 93b fixed to the optical fibers 90a and 90b are urged toward the distal end side by the ferrule urging springs 94a and 94b inside the male connector 10.

  Further, the second connector housing 14 is formed with a hood portion 146 that projects so as to surround the end surface 15 on the front end side. The ferrules 93 a and 93 b housed in the male connector 10 are biased toward the distal end side by the ferrule biasing springs 94 a and 94 b, so that the distal end portion protrudes from the distal end side end surface 15 of the second connector housing 14. The hood portion 146 protects the protruding ferrules 93a and 93b from being damaged or contaminated when the male connector 10 is not fitted to the female connector 20 (non-fitted state). (Especially protecting the end surface on the front side of the ferrule subjected to mirror finishing).

  As can be seen from FIG. 3, the locking piece 145 is formed so as to protrude from the outer peripheral surface of the hood portion 146 (from the most distal end side of the second connector housing 14). As described above, the locking piece 145 is provided using the hood portion 146 protruding from the distal end side surface 15 to protect the ferrules 93a and 93b, so that the first connector housing 12 is fitted in the fitting direction. The size of the second connector housing 14, that is, the size of the male connector 10 can be minimized.

  As shown in FIGS. 1, 2, 4, and 5, the female connector 20 fitted to the male connector 10 configured as described above includes a housing body 22, a board protection member 25, and a shield member 26. It consists of.

  The housing body 22 includes a fitting portion 23 and an element mounting portion 24. When the male connector 10 is inserted, the fitting part 23 is a recessed part formed in a shape surrounding the periphery of the male connector 10. On the inner peripheral surface, a storage recess 231 is formed in which the locking projection 145a of the locking piece 145 of the male connector 10 is stored in a state of being locked to the locking portion 125. In the male connector 10 and the female connector 20, a fitting protrusion 145 b (see FIG. 3) formed on the distal end side with respect to the locking protrusion 145 a is hooked on a hook portion 231 a formed on the distal end of the storage recess 231. It will be in a fitting state.

  The photoelectric conversion elements 92 a and 92 b are mounted on the element mounting portion 24 provided on the proximal end side from the fitting portion 23. The photoelectric conversion element 92a is an element that converts an optical signal transmitted through the optical fiber 90a into an electrical signal. Examples of such an element include a photodiode. On the contrary, the photoelectric conversion element 92b is an element that converts the obtained electrical signal into an optical signal and transmits the optical signal to the optical fiber 90b. Examples of such elements include light emitting diodes. Further, concave portions 921a and 921b are formed on the outer peripheral surfaces of the photoelectric conversion elements 92a and 92b.

  As shown in FIG. 5, the element mounting portion 24 has openings 241 a and 241 b that open in a direction substantially orthogonal to the direction in which the male connector 10 and the female connector 20 are fitted, and protrudes in a substantially U shape. Convex portions (regulating portions) 242a and 242b. The openings 241a and 241b are formed substantially the same as the cross-sectional shapes of the photoelectric conversion elements 92a and 92b, respectively. The photoelectric conversion elements 92a and 92b are mounted in the element mounting portion 24 through the openings 241a and 241b, respectively. At this time, convex portions 242a and 242b provided in the element mounting portion 24 engage with the concave portions 921a and 921b of the photoelectric conversion elements 92a and 92b. Thereby, the movement of the photoelectric conversion elements 92a and 92b attached to the element attachment portion 24, specifically, the movement of the photoelectric conversion elements 92a and 92b in the fitting direction of the male connector 10 and the female connector 20 is restricted. The

  In the optical connector 1 according to this embodiment, one concave portion 921a and 921b formed in the photoelectric conversion elements 92a and 92b, respectively, and one convex portion 242a and 242b formed in the element mounting portion 24 are engaged. As a result, the movement of the photoelectric conversion elements 92a and 92b is restricted. In order to reliably prevent the positional deviation of the photoelectric conversion elements 92a and 92b, two or more sets of concave and convex portions are engaged. You may comprise so that the position control of the photoelectric conversion elements 92a and 92b may be made. In addition, the shapes of the concave portions 921a and 921b and the convex portions 242a and 242b as illustrated are merely examples, and can be appropriately changed.

  As schematically shown in FIGS. 1 and 5, after the photoelectric conversion elements 92 a and 92 b are mounted, a control board 96 for controlling an electrical signal is mounted on the rear end surface of the housing body 22. Specifically, the photoelectric conversion elements 92a and 92b mounted on the element mounting portion 24 are mounted on the control board 96 (the terminal portions 922a and 922b of the photoelectric conversion elements 92a and 92b are inserted into the control board 96 and soldered). The control board 96 is attached to the housing body 22.

  The substrate protection member 25 has a notch 251 and three fixing holes 252. The board protection member 25 is attached so as to cover the control board 96 mounted on the housing body 22. Specifically, the board protection member 25 has three claw portions 232 formed on the outer peripheral surface of the housing body 22 by engaging the notch portion 251 with the protruding portion of the storage recess 231 provided in the housing body 22. Is fixed to the fixing hole 252.

  The shield member 26 is a member for reducing the influence on the control board 26 due to external noise, and is made of, for example, aluminum. The shield member 26 is attached to the outer peripheral surface of the substrate protection member 25 so that the elastic piece 261 provided on the side surface sandwiches the protruding portion 253 formed on the substrate protection member 25. A plurality of protrusions 262 are formed on the end surface of the shield member 26, and the female connector 20 is attached to a substrate or the like (not shown) by the protrusions 262. The shield member 26 is grounded through the protrusion 262.

  When the male connector 10 and the female connector 20 configured as described above are fitted, the ferrule biasing springs 94a and 94b housed in the spring housing holes 124a and 124b are compressed. Thereby, ferrule 93a, 93b is urged | biased toward the front end side, and the front-end | tip will be in the state faced | matched with photoelectric conversion element 92a, 92b.

  As shown in FIG. 2B, when the male connector 10 and the female connector 20 are in the fitted state, the hood portion 146 of the male connector 10 opens the opening of the element mounting portion 24 of the female connector 20. It is located so as to shield the parts 241a and 241b. Therefore, such a configuration prevents problems such as dropping off of the photoelectric conversion elements 92 a and 92 b from the element mounting portion 24 and foreign substances entering the element mounting portion 24.

  Thus, when the male connector 10 and the female connector 20 are in a non-fitted state (before assembly), the hood portion 146 formed on the male connector 10 is the front end side end surface of the male connector 10. 15 plays a role of protecting the end surfaces (mirror-finished surfaces) of the ferrules 93a and 93b protruding from 15. On the other hand, when the male connector 10 and the female connector 20 are in a fitted state (after assembly), the openings 241a and 241b of the element mounting portion 24 are shielded and the photoelectric conversion element 92a from the element mounting portion 24 is shielded. , 92b, and a member for preventing foreign matter from entering the element mounting portion 24.

  That is, in the optical connector 1 according to this embodiment, as described above, the mounting accuracy of the photoelectric conversion elements 92a and 92b to the female connector 20 (particularly, the mounting accuracy in the fitting direction of the male connector 10 and the female connector 20). ) Is provided so that the openings 241 a and 241 b of the element mounting portion 24 are opened in a direction perpendicular to the fitting direction of the male connector 10 and the female connector 20. However, by providing the openings 241a and 241b that open in such a direction, there is a high risk that the photoelectric conversion elements 92a and 92b may drop off from the element mounting part 24, or foreign substances may enter the element mounting part 24. . For such a problem, in the present embodiment, the hood portion 146 that protects the ferrules 93a and 93b in the non-fitted state functions as a member that shields the openings 241a and 241b in the fitted state. Without providing a new member or the like, the photoelectric conversion elements 92a and 92b are prevented from falling off from the element mounting portion 24 and foreign matters are prevented from entering the element mounting portion 24.

  In addition, the length (length in the fitting direction of the male connector 10 and the female connector 20) of this hood part 146 is not specifically limited. Specifically, the above-described ferrules 93a and 93b have a sufficient protection function, and the opening portions so that the photoelectric conversion elements 92a and 92b do not fall off and foreign matter does not enter the element mounting portion 24. If it has a length that shields 241a and 241b, it can be appropriately increased or decreased.

  Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention. For example, in the above-described embodiment, it has been described that the movement of the photoelectric conversion elements 92a and 92b in the fitting direction of the male connector 10 and the female connector 20 is restricted by the restriction portions 242a and 242b. , 92b may be configured to be restricted from moving in the rotational direction. Specifically, the photoelectric conversion elements 92a and 92b are formed to have a non-circular cross section, and the element mounting portion 24 has a shape matching the non-circular shape (for example, both have a so-called D-cut shape). The rotation of the photoelectric conversion elements 92a and 92b in the element mounting portion 24 may be restricted.

1 optical connector 10 male connector (first connector)
146 Hood part 20 Female connector (second connector)
24 Element mounting portions 241a and 241b Openings 242a and 242b Convex portions (regulating portions)
90 Optical cables 90a, 90b Optical fibers 92a, 92b Photoelectric conversion elements 921a, 921b Recesses 93a, 93b Ferrule

Claims (4)

  A first connector to which an optical cable having an optical fiber is attached, and a photoelectric that is detachably fitted to the first connector and performs photoelectric conversion between an optical signal transmitted to the optical fiber and an electric signal. In the optical connector including the second connector to which the conversion element is attached, the second connector is opened in a direction substantially orthogonal to a direction in which the first connector and the second connector are fitted. An element mounting portion having an opening is formed, and the element mounting portion is provided with a regulating portion that restricts the movement of the photoelectric conversion element mounted on the element mounting portion from the opening. A featured optical connector.   The photoelectric conversion element is formed with at least one convex portion or a concave portion, and the element mounting portion is a concave portion that is the restricting portion formed to engage with the convex portion or the concave portion of the photoelectric conversion element. Or the convex part is provided, The optical connector of Claim 1 characterized by the above-mentioned.   A ferrule into which the end portion of the optical fiber is inserted is provided in the first connector, and a front end side end surface of the ferrule is surrounded by a hood portion so as not to protrude outward. The optical connector according to claim 1 or 2.   The opening part of the said element mounting part is shielded by the said hood part partially or entirely in the state which said 1st connector and said 2nd connector fitted. The optical connector as described in.

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