Abstract:
An optical connector includes a connector body that has a first optical fiber housed in advance in a ferrule so as to project from a back end of the ferrule opposite to the connecting end surface and an anchoring fixture that anchors a second optical fiber that is to be optically connected to the first optical fiber, and by pressing the anchoring fixture into the connector body while the second optical fiber is anchored in this anchoring fixture, the anchoring fixture and the connector body are connected to optically connect the first optical fiber and the second optical fiber, and the connecting portion that connects the anchoring fixture and the connector body form a movable connecting portion that is adapted to vary the direction of the anchoring fixture with respect to the connector body.

Description:
BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   The present invention relates to an optical connector used in the connection of optical fibers. 
   Priority is claimed on Japanese Patent Application No. 2006-62913, filed Mar. 8, 2006, the content of which is incorporated herein by reference. 
   2. Description of Related Art 
   In recent years, an optical connector has been propose, of which assembling operation can be carried out at a connection site other than a factory. For such an optical connector, an optical connector including a ferrule that houses and fastens an optical fiber in advance after the distal end surface thereof has been polished and a clamping portion disposed on the back portion (the position on the side opposite to the distal end surface) of this ferrule has been proposed. In this optical connector, in the clamping portion the optical fiber (below, the inner optical fiber) on the ferrule side and another connection optical fiber (below, the iron optical fiber) that abuts this optical fiber are maintained in an abutted and connected state by being clamped in split elements of the clamping portion. Here, because the size of the clamping portion is small, a dedicated tool that carried out the opening and closing operation of the elements (optical fiber tool) has been proposed (for example, refer to Japanese Unexamined Patent Application, First Publication No. 2002-23006, Japanese Unexamined Patent Application, First Publication No. 2002-55259, and Japanese Unexamined Patent Application, First Publication No. 2005-99706). 
   At the same time, during the assembly of this type of optical connector, it is very important that the back end of the inner optical fiber housed in advance and the distal end of the insertion optical fiber to be inserted are reliably abutted. Thus, conventionally, the reliable abutment of the distal end of the insertion optical fiber with the back end of the inner optical fiber has been confirmed visually. Concretely, by visually confirming the bending of the insertion optical fiber that occurs when the distal end of the insertion optical fiber is abutted against the inner optical fiber, it is confirmed that the optical fibers are correctly abutting each other. 
   However, when the insertion optical fiber is attached to the optical fiber after bending in the manner described above, the following inconveniences occur. Specifically, because a portion of the insertion optical fiber bends, a misalignment occurs between the optical axis of the insertion optical fiber and the optical axis of the inner optical fiber. In addition, when the optical fiber is bent, at the bending location, loss may occur in the propagated light. In addition, when the ached optical connector (the male optical connector) is fitted into the other adaptor (the female optical connector), the insertion optical fiber described above is generally retracted. Thereby, the bending of the optical fiber (coated optical fiber) is further increased, and the inconveniences described above become severe. 
   SUMMARY OF THE INVENTION 
   In consideration of the problems described above, an object of the present invention is to provide an optical connector that is structured such that the bending of the bent insertion optical fiber is decreased due to reliably abutting the back end of the inner optical fiber and the distal end of the optical fiber, and wherein the inconvenience of loss occurring in the propagated light is eliminated, and light is advantageously propagated. 
   In order to solve the problems described above, an optical connector having the devices described below is provided. 
   Specifically, a first aspect of the present invention is an optical connector that includes a connector body and an anchoring member. In the connector body, an inner optical fiber is built in that is housed and fastened by the ferrule whose connecting end surface is disposed in the distal end side and a portion of which projects from the back end side of this ferrule. The anchoring member holds the insertion optical fiber whose distal end is abutted and optically connected to the back end of the inner optical fiber, and the distal end of the insertion optical fiber can abut against the back end of the inner optical fiber when brought into contact with the connector body. A cover body is provided on the connector body. The cover body is pivotable between a stand-by position and a holding position. In the stand-by position, an axis of the cover body is out of alignment with an axis of insertion direction of the insertion optical fiber and the anchoring member is approachable to the connector body. In the holding position, the axis of the cover body is aligned with the axis of insertion direction of the insertion optical fiber and the anchoring member is covered and held by the cover body. An abutting convexity that abuts a distal end side wall surface of the anchoring member is provided so as to project on the inside surface of the outer cover opposite to the outer surface of the anchoring member side. When the cover body is rotated from the stand-by position to the holding position, the abutment convexity abuts the distal end side wall surface of the anchoring member such that the anchoring member moves while being pushed towards the retaining direction. 
   A second aspect of the present invention is characterized in that, in the optical connector of the sixteenth aspect, the abutting surface of the abutment convexity that abuts the distal end side wall surface of the anchoring member is formed to incline in the insertion direction of the insertion optical fiber from the center portion towards the distal end portion. 
   A third aspect of the present invention is characterized in that, in the optical connector of the sixteenth aspect, a retraction restricting convexity, which restricts the movement of the anchoring member in the retraction direction by abutting the back end side wall space of the anchoring member when the cover body is positioned at the holding position, is provided so as to project on the back end portion of the cover body. 
   A fourth aspect of the present invention is characterized in that, in the optical connector of the sixteenth aspect, a projecting portion that projects in the transverse direction is provided on the anchoring member. An engaging window portion passes through the cover body in the transverse direction. When the cover body is positioned in the holding position, the projecting portion of the anchoring member allows play, and can thereby engage the engaging window portion. 
   A fifth aspect of the present invention is characterized in that, in the optical connector of the sixteenth aspect, a latch portion that projects towards the distal end side is provided on the connector body. 
   A sixth aspect of the present invention is characterized in that, in the optical connector of the sixteenth aspect, a clamping portion that accommodates clamped half split elements is built into the connector body, and at the same time, insertion members that are wedged into the split of these clamped elements are provided. 
   According to the optical connector of the present invention, the bending of the insertion optical fiber that is bent because of the reliable abutment between the back end of the inner optical fiber and the distal end of the insertion optical fiber is decreased, and the inconvenience in which loss occurs in the propagated light is eliminated. Thereby, in the optical connector, the inner optical fiber and the insertion optical fiber are properly connected, and light is advantageously propagated. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  is a perspective view (cover body in the stand-by position) of the entire optical connector in an embodiment of the present invention. 
       FIG. 2  is a perspective view (cover body in the holding position) of the entire optical connector in the embodiment of the present invention. 
       FIG. 3  is a horizontal cross-sectional drawing of the optical connector in  FIG. 29 . 
       FIG. 4  is a vertical cross-sectional drawing (cover body in the stand-by position) of the optical connector in  FIG. 1 . 
       FIG. 5  is a vertical cross-sectional drawing (cover body in the holding position) of the optical connector in  FIG. 1 . 
       FIG. 6A  is an upper view of the connector body, and  FIG. 6B  is a side view of the connector body. 
       FIG. 7  is a perspective view of the connector body. 
       FIGS. 8A and 8B  are perspective views of the clamping member. 
       FIG. 9A  is a perspective view of the clamping portion accommodated in the clamping member in  FIGS. 8A and 8B , and  FIG. 9B  is a cut-away side view thereof. 
       FIG. 10  is a perspective view of the cover body. 
       FIG. 11A  is a plan view of the guiding plate,  FIG. 11B  is a side view of the guiding plate, and  FIG. 11C  is a front view of the guiding plate. 
       FIG. 12A  is a perspective view of the anchoring member, and  FIG. 12B  is a schematic plan view of the anchoring member. 
       FIG. 13A  is a perspective view of the insertion unit, and  FIG. 13B  is a front view of the insertion unit. 
       FIGS. 14A to 14E  are drawings of the assembled optical connector. 
   

   DETAILED DESCRIPTION OF THE INVENTION 
   Hereafter, an embodiment of the present invention will be explained with reference to the drawings.  FIG. 1  is a perspective view of the entire optical connector (where the cover body is in the stand-by position) according to the present invention.  FIG. 2  is a perspective view of the entire optical connector (where the cover body is in the holding position) according to the present invention  FIG. 3  is a horizontal cross-sectional drawing of the optical connector in  FIG. 1 .  FIG. 4  is a vertical cross-sectional drawing (where the outer cover is in the stand-by position) of the optical connector in  FIG. 1 .  FIG. 5  is a vertical cross-sectional drawing (where the outer cover is in the holding position) of the optical connector of  FIG. 1 .  FIG. 6A  is a plan view of the connector, and  FIG. 6B  is a side view of the connector.  FIG. 7  is a perspective view of the connector body.  FIG. 8A  and  FIG. 8B  are perspective views of the clamping member.  FIG. 9A  is a perspective view and a cut-away view of the clamping portion accommodated in the clamping member shown in  FIGS. 8A and 8B , and  FIG. 9B  is a cut-away side drawing of the same.  FIG. 10  is a perspective view of the cover body.  FIG. 11A  is a plan view of the guiding plate,  FIG. 11B  is a side view of the same, and  FIG. 11C  is a front view of the same.  FIG. 12A  is a perspective view of the anchoring member, and  FIG. 12B  is a schematic plan view of the same.  FIG. 13A  is a perspective view of the insertion unit, and  FIG. 13B  is a front view of the same.  FIGS. 14A ,  14 B,  14 C,  14 D, and  14 E are drawings showing the attachment of the optical connector. 
   Reference numeral  1  in  FIG. 1  and  FIG. 2  denotes the optical connector according to the present invention. This optical connector  1  is an optical connector that is generally assembled at a connection site. Note that the only difference between the optical connectors  1  disclosed in  FIG. 1  and  FIG. 2  is that the positions of the cover body  40  are different. As shown in the cross-sectional drawing in  FIG. 3 , this optical connector  1  connects the optical fibers G and F together by abutting the distal end of an insertion optical fiber F (a separate optical fiber from the inner optical fiber G) against the back end of the inner optical fiber G, which is housed and fastened by the ferrule  3 . Note that in each of the cross-sectional drawings of  FIG. 3  to  FIG. 5 , the illustration of the clamping portion  31  has been omitted so that the inner optical fiber G and the insertion optical fiber F are easy to see. In addition, the abutment point where the distal end of the insertion optical fiber F abuts the back end of the inner optical fiber G is denoted by the reference numeral P. 
   Although not specially illustrated, the optical connector  1  is a male optical connector that forms an optical connection by being inserted into another optical connector (the female optical connector). Note that when this optical connector  1  is inserted into another optical connector, the connecting end surface  2 A of the ferrule  2  disposed at the distal end side of this optical connector  1  is abutted together with the connection end surface of the ferrule provided on the other optical connector, and thereby an optical connection is established. 
   In this optical connector  1 , the distal end side at which the connecting end surface  2 A of the built-in ferrule  2  is disposed is denoted by reference letter T, and the back end side opposite to the side at which this ferrule  2  is disposed is denoted by reference letter S. In addition, in the explanation of each of the parts below, although no reference numeral is attached, in the optical connector  1 , the term “distal (end side)” is the direction towards the reference letter T, which is the direction towards the connecting end side of the ferrule, and in the optical connector  1 , the term “back (end side)” is the direction towards the reference letter S, which is the direction opposite to the distal end side. These terms are used uniformly in this manner. Furthermore, the insertion direction of the insertion optical fiber F that is inserted into the optical connector  1  is the direction denoted by the reference letter T, and the axis thereof is denoted by the reference letter H. 
   The insertion optical fiber F that is inserted into this optical connector  1  is formed by the coated optical fiber F 2 , which is a resin cover provided on the outer periphery of the bare optical fiber F 1  and an optical fiber cable F 4  (indoor cable, drop cable, or the like), which is an outer cover provided, on the outer periphery of the optical fiber cable F 2 . However, the definition of the term “insertion optical fiber cable F” as used below includes all the bare optical fiber F 1 , the coated optical fiber F 2 , an optical fiber element F 5 , and the optical fiber cable F 4 . 
   As shown in  FIG. 1  and  FIG. 2 , this optical connector  1  provides mainly a connector body  10  (refer, for example, to  FIG. 3 ) having a ferrule  2  built in, and an anchoring member  60  (refer, for example, to  FIGS. 12A and 12B ) that is formed so as to be able to approach the connector body  10 , and holds the insertion optical fiber F. First, the connector body  10  will be explained. As shown in the perspective view of  FIG. 7 , the connector body  10  includes mainly an outer housing  11 , and an inner housing  20  built inside this outer housing  11  so as to be able to move slightly in a the insertion direction (the direction of the distal end side T) of the insertion optical fiber F. 
   As shown in each of the cross-sectional drawings in  FIG. 3  to  FIG. 5 , in the plan view of  FIG. 6A , and in the side view of  FIG. 6B , this outer housing  11  is formed by the housing body  12  and an operating portion  13  provided integrally on the housing body  12  from the back end side of this housing body  12  in the transverse direction. This connector body  12  has a substantially tubular form that can be built into the inner housing  20 . The operating portion  13  is formed from a handle portion  14  that is connected to the housing body  12  on the back end side S and a latch portion  15  that is provided so as to extend from this handle portion  14  towards the distal end side T. Lateral grooves are cut into the outer surface of the handle portion  14  so as to allow easy grasping by a hand. The latch portion  15  is a part that is fit into a recess provided in the other optical connector (the female optical connector) that is not illustrated, and like a typical latch, catches  16  that elastically deform inward are provided. In addition, on the upper surface of the housing body  12 , through holes  17  are provided at two locations positioned extending on the axis of the insertion direction of the insertion optical fiber F. The through holes  17  allow the insertion members  75  provided in the insertion unit  70  to penetrate. 
   As shown in each of the cross-sectional drawings in  FIG. 3  to  FIG. 5 , the inner housing  20  built into the outer housing  11  formed in this manner is formed by the clamping frame  21  and the clamping member  30  becoming integrated. As shown in the figures, the clamping frame  21  is structured similarly to a plug frame generally used, and is formed such that the distal end side and the back end side communicate. A ferrule  2  is provided that is fastened inside. In addition, a plug frame side engaging recess  22  is provided on the back end side of the plug frame  21 . The plug frame  21  and the clamping member  30  are integrally formed by the plug member side engaging projection  32  provided on the distal end side of the plug member  30  (more specifically, the distal end side of the plug portion  31 ) being engaged in this plug frame side engaging recess  22 . Specifically, they form the inner housing  20 . Note that, as described below, because the clamping portion  31  that is built into the clamping member  30  is supported elastically this plug frame  21  can deforms flexibly towards the distal end side and the back end side. 
   The ferrule  2  that is fastened and built into this plug frame  21  provides thereon a small hole  23  that communicates with the distal end side and the back end side. This small hole  23  is formed so as to be disposed on the same axis as the axis H of the insertion optical fiber F described above. In addition, the distal end surface of the ferrule  2  is formed as a connecting end surface  2 A that connects with the ferrule in the other optical connector, and is exposed at the distal end side of the optical connector  10 . In addition, the back end portion of the ferrule  2  is fit into the tube portion  33  of this clamping member  30  so as to be insured from the opening portion  33   a  of the tube portion  33  of the clamping member  30 . In addition, the back end surface of the ferrule  2  abuts the distal end surface of the clamping portion  31  that is flexibly supported in this tube portion  33 . This ferrule  2  is formed by a ceramic such as zirconium or a rigid material such as a glass. In addition, the center portion of the outer periphery of the ferrule  2  and the inner part of the plug frame  21  described above contact so as to press on each other, and thereby, the ferrule  2  is built-in to the plug frame  21  in a fastened state. 
   Net the clamping member  30 , which is integrally engaged and integrated with the clamping frame  21  sutured as described above, will be explained. As shown in  FIG. 8A  and  FIG. 8B , this clamping member  30  includes a tube portion  33  that extends in a substantially tubular shape towards the distal end side, and a guiding case  34 , which is connected to the back end of this tube portion  33  and communicates with the inside thereof. In addition, inside the tube portion  33 , a clamping portion  31  is accommodated at a location where the back end of the inner optical fiber G and the distal end of the insertion optical fiber F abut. 
   As described above, the inside portion of the tube portion  33  is hollow, and at the same time, a clamping member side engaging projection  32  that projects outward is provided in the outer peripheral direction of the outer peripheral surface of the distal end side thereof. In addition, in the outer peripheral surface (the upper side of the figure) of the tube portion  33 , a through hole  33   b  that allows penetration of the insertion members  75  provided in the insertion unit  70  is provided at two locations at a position extending on the axis of the insertion direction of the insertion optical fiber F. 
   The inside of this guiding case  34  that is connected to the back end of the tube portion  33  is disposed on the axis of the insertion direction of the insertion optical fiber F, and communicates with the inside of the tube portion  33 . In addition, the opening portion  34   a  provided on the back end side of this guiding case  34  is formed in a rounded funnel shape whose diameter increases towards the back end side. Because the opening portion  34   a  has a funnel shape, the insertion optical fiber F can be advantageously guided so as to align with the axis of the insertion direction when inserted inside the clamping member  30 . In addition, on the outer wall of this guiding case  34  in the transverse direction, columnar rotation axles  35  are provided that projects transversely outward. These rotation axles  35  are at locations where they can be fit into the rotation holes  42  provided on the cover body  40 . The cover body  40  having the rotation holes  42  into which the rotation axles  35  are fit is structured so as to enable rotation in which the axis of these rotation axles  35  serves as the rotation axis. In addition, at the bottom portion of this guiding case  34 , an insertion hole  39  along the insertion direction of the insertion optical fiber F is provided. The hoe shaped portions  54  and the guiding plate portion  51  provided on the guiding plate  50  are inserted into this insertion hole  39 . 
   In addition, the clamping portion  31  is accommodated in the tube portion  33  described above. Specifically, as shown in  FIG. 9A  and  FIG. 9B , in the clamping portion  31 , half split elements  36  and  37  are clamped by the C-shaped spring  38  formed in a substantially tube shape that has a C-shape in cross-section, and are thereby elastically supported. As illustrated, suitable inner grooves  36   a  and  37   a  are provided in these half split elements  36  and  37 . Concretely, the large diameter inner groove  36   a  extending along the axis of the insertion direction of the insertion optical fiber F is provided in the facing surface  36   b  of one half split element on only one side. In addition, a large diameter inner groove  37   a   1  and a small diameter inner groove  37   a   2  that extend along the axis of the insertion direction of the insertion optical fiber F are provided as inner grooves  37   a  in the facing surface  37   b  of the other half split element  37 . Note that the inner optical fiber G and the insertion optical fiber F are inserted into these inner grooves  36   a  and  37   a . More specifically, the inner optical fiber G and the insertion optical fiber F, which are bare optical fibers, are inserted into the small diameter inner groove  37   a   2 , and the insertion optical fiber F, which is the coated optical fiber F 2  portion, is inserted into the large diameter inner grooves  36   a  and  37   a   1 . The difference in the length of the diameter of the small diameter and the large diameter is suitable adjusted depending on the thickness of the resin that covers the optical fibers. 
   In the clamping portion  31  formed in this manner, an insertion member  75  of the insertion unit  70  is wedged into the gap  38   a  in the C-shaped spring  38  and the slit  38   b  formed in alignment with the half split elements  36  and  37 . In this manner, when an insertion member  75  of the insertion unit  70  is wedged into the slit  38   b  between the half split elements  36  and  37 , the slit  38   b  of the clamped elements  36  and  37  is expanded. Thereby, the bare optical fiber F 1  of the insertion optical fiber F can be inserted into the small diameter inner groove  37   a   2  described above, and in addition, the coated optical fiber F 2  of the insertion optical fiber F can be inserted into the large diameter inner grooves  36   a  and  37   a   1  described above. Note that the inner optical fiber G has alay been inserted into the small diameter inner groove  37   a   2  described above. 
   Note that inside this tube portion  33 , although not specifically illustrated, a suitable gap is provided between the clamping portion  31  and the guiding case  34 , and a suitable urging spring is interposed in this suitable gap. One end of this urging spring abuts the inner wall surface of the guiding case  34  and the other end of the urging spring abuts the back end of the clamping portion  31 . That is, this clamping portion  31  is urged towards the insertion direction of the insertion optical fiber F by the urging spring (not illustrated), and the distal end thereof advantageously abuts the back end of the ferrule  2 . In addition, the ferrule  2  and the clamping portion  31  are advantageously urged as a whole towards the distal end side. Thereby, for example, when the optical connector  1  is connected to the other optical connector, the ferrule  2  is suitably moved to the distal end side or the back end side, and thereby it is possible to exhibit a suitable shock absorbing function. 
   Next, the cover body  40  that rotates pivoted on the rotation axle  35  provided on the guiding case  34  of the clamping member  30  described above will be explained. As shown in  FIG. 10 , the cover body  40  is formed having a U-shape in cross-section. On this cover body  40 , a distal end side opening portion  41   a  is provided on the distal end side (T direction) so as to hold the anchoring member  60 , and at the same time, a back end side opening portion  41   b  is provided on the back end side (S direction). Furthermore, the bottom side thereof is also formed so as to open. In other words, this cover body  40  is formed having an upper wall portion  40   a  and side wall portions  40   b  that are connected to this upper side wall  40   a  and disposed parallel to each other. Thereby, it is possible to fit the anchoring member  60  into this cover body  40 , and it is further possible to dispose the insertion optical fiber F that is anchored in this anchoring member  60  towards the distal end side. 
   In addition, on the side wall portions  40   b  of this cover body  40 , rotating holes  42  and  342  that pass through in the transverse direction are provided in proximity to the distal end side opening portion  41   a . The rotating axles  35  provided on the guiding case  34  of the clamping member  30  described above are fit into these rotating holes  42 . Thereby, this cover body  40  can rotate on the axis of this rotation axle  35 , which serves as the axis of rotation. Furthermore, long engaging holes  46  that pass through in the transverse direction (corresponding to the engaging window portion in the present invention) are provided in the middle portion of the side wall portions  40   b  of the cover body  40 . These long engaging holes  46  are formed having a rectangular we extending towards the distal end side (the T direction) and the back end side (the S direction) at the locations where the engaging projecting portions  65  (corresponding to the projecting portions in the present invention) that are provided on the anchoring member  60  are fit. Note that the engaging long holes  46  provided on this cover body  40  are formed having a size that allows play when the engaging projecting portions  65  provided on the anchoring member  60  are fit therein. 
   In addition, a guiding projection portion  43  (corresponding to the abutment convexity in the present invention) is provided on the inner surface side (below, referred to as the inside surface) of the side wall portions  40   b  of this cover body  40 . Note that in  FIG. 10 , only one side is illustrated. Concretely, this guiding projection portion  43  is provided between the fitting holes  42  and the long engaging holes  46 . The guiding projection portion  43  has a substantially regular parallelepiped shape that extends in the direction orthogonal to the direction of the axis I of the cover body  40 , and projects towards the inside of the cover body  40 . In addition, a guiding surface  44  is formed on the guiding projection portion  43 . The distal end side wall portion of the anchoring member  60  abuts and is guided by this guiding projection portion  43 . Concretely, an abutment commencement surface  44   a  and an abutment holding surface  44   b  are provided. The abutment commencement surface  44   a  is formed inclined toward the insertion direction (the T direction) of the insertion optical fiber F from the center portion thereof towards the distal end portion of the lower side thereof. The abutment holding surface  44   b  is formed orthogonal to the insertion direction (the T direction) of the insertion optical fiber F crossing from the center portion thereof to the distal end portion of the upper side thereof. In addition, a retraction restricting convexity  45  that projects inward is provided on the back end of this cover body  40 . 
   Next the guiding plate  50  will be explained, The guiding plate  50  is installed on the bottom of the clamping member  30  described above, and guides the anchoring member  60  from the bottom side when the anchoring member  60  is approaches or separates from the connector body  10 . As shown in  FIGS. 11A to 11C , the guiding plate  50  is formed by a guiding plate portion  51  that extends in the insertion direction of the insertion optical fiber F and a handle plate portion  52  that is connected to the back end of this guiding plate portion  51  and extends on the same axis. The guiding plate portion  51  is the part that is inserted into the guiding insertion hole  68  provided on the anchoring member  60 , and at the back end portion, which borders with the handle plate portion  52 , an abutment projection  53  that projects upward is provided. This abutment projection  53  is a part that abuts the back end side wall surface  67 . In addition, hoe shaped portions  54 , which project from both sides of the distal end in the transverse direction, are provided on the guiding plate portion  51 . These hoe shaped portions  54  are formed having a how shape whose distal end expands in the transverse direction. The guiding plate portion  51  and the hoe shaped portions  54  are inserted into the insertion hole  39  provided on the bottom portion of the clamping member  30  described above. Thereby, the guiding plate  50  is supported so as to be able to move longitudinally and guided in the insertion direction of the insertion optical fiber F. In addition, the extraction of the guiding plate portion  51  from the insertion hole  39  is restricted by the hoe shaped portions  54 . The handle plate portion  52  connected to the back end of the guiding plate portion  51  is a part that is grasped by a hand. The operator gasps the handle plate portion  52  by one hand, and can move this guiding plat  50  longitudinally so as to approach and separate from the clamping member  30 . 
   Next, the anchoring member  60  that holds the insertion optical fiber F will be explained. As shown in  FIG. 12A , this anchoring member  60  includes an anchoring member body  61  and a lid member  62 . The anchoring member body  61  has a U-shape in cross-section and opens upward. The lid portion  62  is thin and hinged at the upper edge portion of the anchoring member body  61  in the traverse direction. In addition, the anchoring member body  61  has a bottom wall portion  61  a and side wall portions  61   b  connected to this bottom wall portion  61   a  and disposed parallel to each other. That is, the anchoring member body  60  is open at the distal end side and the back end side thereof. Thereby, the insertion optical fiber F can be disposed so as to extend towards the distal end side. Note that these side wall portions  61   b  form the distal end side wall surface  66  and the back end side wall surface  67  of the anchoring member  60 . 
   In addition, concavo-convex holding portions  63  are provided on the side surface (below, referred to as the inside wall) of the recessed grooves  61   c  that form the inner portion of the side wall portions  61   b  of the anchoring member body  61 . The concavo-convex holding portions  63  have a concavo-convex form extending from the middle portion to the back end orthogonal to the insertion direction of the insertion optical fiber F. Note that in  FIG. 12A , only one side is illustrated. These concavo-convex holding portions  63  are parts that hold the insertion optical fiber F by compressing the outer cover of the insertion optical fiber F (the optical fiber cable F 4 ). In addition, the lid portion  62  is provided so as to outer cover these concavo-convex holding portions  63 . That is, similar to the concavo-convex holding portions  63 , the lid portion  62  is set to a length that extends from the middle portion to the back end, and hinges the upper edge of the anchoring member body  61  in the transverse direction. Note that on the part of the lid portion  62  opposite to the part that is hinged, a engaging projection  62   b  that engages the engaging recess portion  62   a  provided on the anchoring member body  61  is provided. In addition, on the inside surface of the side wall portions  61   b  of the anchoring member body  61 , the inside surface extending from the middle portion to the distal end is formed flat. 
   In addition, on the outer surface side (below, referred to as the outside surface) of the side wall portions  61   b  of the anchoring member body  61 , at the bottom portion side, an engaging projection portions  65  are provided that project transversely outward extending in the insertion direction of the insertion optical fiber F. These engaging projection portions  65  are parts that fit into the long engaging holes  46  provided on the cover body  40  described above so as to allow play, and the upper surfaces thereof are formed to incline so as to descend outward. Thereby, when this engaging projection portion  65  is fit into the long engaging hole  46 , the engagement is smoothly carried out. In addition, a guiding insertion hole  68  formed to extend in the insertion direction of the insertion optical fiber F so as to pass through the thick bottom wall portion  61  is provided. The guiding plate portion  51  of the guiding plate  50  is inserted into this insertion hole  68 , as described above. In addition, each portion of this anchoring member body  61  is designed with the following length allocations. Specifically, as shown in the schematic plan view in  FIG. 12B , the total length D 1  of the anchoring member body  61  that extends in the insertion direction (the T direction) of the optical fiber F (for example, 11.9 mm) is designed to be long in comparison to a conventional one. In addition, the concavo-convex holding portions  63  provided in the recessed grooves  61   c  forming the inner portion of the anchoring member body  61  are provided in this recessed groove  61   c  from a position separated distance D 2  (for example, 1.7 mm) from the back end portion, which corresponds to the back end side wall portion  67 , to a position separated distance D 4  (for example, 6.9 mm) from the distal end portion which corresponds to the distal end side wall surface  66 . Specifically, the concavo-convex holding portions  63  have a length D 3  (for example, 3.3 mm), and are provided in this recessed groove  61   c.    
   Because the anchoring member body  61  is designed having a long D 1  in comparison to the conventional length, the anchoring member body  61  is easily held in the hand and easy to handle by the user. In addition, in the recessed groove  61   c , because the back end of the concavo-convex holding portions  63  is positioned separated distance D 2  from the back end portion of the anchoring member body  61 , a suitable clearance is naturally formed from the back end of part that holds the insertion optical fiber F to the back end side wall surface  67 . Thereby, even when the insertion optical fiber F bends, bending is not hindered due to this clearance, and furthermore, it is possible to bend gently, In this manner, when the bending of the insertion optical fiber F is gentle, there is the advantage that the optical loss that caused by this bending can be made small. Note that when the distance D 4  where the coated optical fiber F 2  is positioned is designed to be long, the anchoring member body  61  is easy to hold by hand and thus easy to handle to the user. However, taking into consideration problems such as size, a length D 4  that ensures the distance D 1  is selected. 
   The anchoring member body  60  in this embodiment is formed by integrally molding the anchoring member body  61  and the lid portion  62 ; however, an anchoring member body and a lid portion may be separately provided. 
   Next the insertion unit  70  will be explained. As shown in  FIG. 13A  and  FIG. 13B , the insertion unit  70  includes a pressing ring portion  71  that is formed in a ring shape and insertion members  75  that are provided so as to project inward from the upper wall portion  72  of the pressing ring portion  71 . As shown in  FIG. 13B , this pressing ring portion  71  is formed so as to be able to bend and extend in a vertical direction. Specifically, when the upper wall portion  72  of this pressing ring portion  71  is pressed towards the bottom wall portion  73 , the side wall portions  74  expand in the transverse direction, and the upper wall portion  72  and the lower wall portion  73  approach each other. Thereby, the insertion member  75  provided on this upper wall portion  72  moves so as to project downward in  FIG. 13B . Alternately, when the side wall portions  74  are pressed together so as to approach each other, the insertion members  75  move so as to be extracted. 
   Specifically, the insertion members  75  that penetrate through the through holes  17  provided in the housing body  12  and the through holes provided in the clamping member  30  expand the slit  38   b  between the half split elements  36  and  37  by resisting the elasticity of the C-shaped spring  38 , and in this state, the insertion optical fiber F can be inserted into the slit  38   b  between the half split elements  36  and  37 . Then, when the side wall portions  74  are pressed so as to approach each other, it is possible to exact he insertion members  75  from the slit  38   b  between the half split elements  36  and  37 . Note that reference numeral  76  is the installation support member for installation on the connector body  10 . In addition, a suitable stopper  79  is installed on the installation support portion  76  before the connection operation, as showed in the side view in  FIG. 6B . 
   Next, the procedure in which the insertion optical fiber F is inserted and attached to the optical connector  1  described above will be explained with reference to  FIGS. 14A to 14E . 
   First, as shown in  FIG. 14A , a suitable amount of the resin coat of the insertion optical fiber F is removed to expose the bare optical fiber F 1 . Then, as described above, this insertion optical fiber F is anchored in the anchoring member  60  by holding the insertion optical fiber F in the concavo-convex holding portions  63  and closing the lid portion  62 . At this time, the length of the bare optical fiber F 1  and the coated optical fiber F 2  are preferably set at a length such that the distal end of the insertion optical fiber F (bare optical fiber F 1 ) in the clamping portion  31  bends 0.55 mm when abutted against the back end of the inner optical fiber G. This bending is visually confirmed because the ease of visual conformation is ensured. Note that in this case the cover body  40  of the optical connector  1  is in a stand-by position. That is, the axis H in the insertion direction of he insertion optical fiber F and the center axis I of the cover body  40  are different (deviate from each other). 
   Next, as shown in  FIG. 14B , the anchoring member  60  that is holding the insertion optical fiber F is installed on the guiding plate  50 . Concretely, the guiding plate portion  51  of the guiding plate  50  is inserted into the guiding insertion hole  68  of the anchoring member  60 , and then this guiding plate portion  51  is inserted and installed in the insertion hole  39  of the clamping member  30 . Then the anchoring member  60  is made to approach the connector body  10  while being guided by the guiding plate  50 . Thereby, as shown in  FIG. 14C , the anchoring member  60  approaches the connector body  10 , and at the same time, the insertion optical fiber F that is held by the anchoring member  60  also enters the guiding case  34  of the clamping member  30 , and finally the insertion optical fiber F (bare optical fiber F 1 ) is held in the small diameter inner groove  37   a   2  in the elements  36  and  37  of the clamping portion  31 . In this case, the slit  38   b  of the clamped elements  36  and  37  is expanded by the insertion members  75 . 
   Thereby, as shown in  FIG. 14C , in the clamping portion  31 , the distal end of the insertion optical fiber F (the bare optical fiber F 1 ) abuts the back end of the inner optical fiber G. Then, when the incision optical fiber F is inserted, the bending (reference letter E) of the insertion optical fiber F (bare optical fiber F 1 ) itself begins to occur. By confirming this bending (reference letter E) visually, the operator can confirm that the distal end of the insertion optical fiber F (bare optical fiber F 1 ) that is inserted in the clamping portion  31  has abutted the back end of the inner optical fiber G. Note that the reference letter K in the figure denotes the distance between the anchoring member  60  and the connector body  10  while the fibers are abutted. 
   In this manner, when the operator has confirmed that the distal end of the insertion optical fiber F (bare optical fiber F 1 ) in the clamping portion  31  has abutted the back end of the inner optical fiber G, next, as shown in  FIG. 14D , the cover body  40 , which is in the stand-by position, rotates to the holding position. When this cover body  40  has rotated, the abutment commencement surface  44   a  of the guiding projection portion  43  provided on this cover body  40  starts to abut the distal end side wall surface  66  of the anchoring member  60 . Next, the abutment commencement surface  44   a  of this guiding projection portion  43  moves the anchoring member  60  by pushing at the back end side while abutting the distal end side wall surface  66  of the anchoring member  60  along with the rotation of the cover body  40 . At this time, because the abutment commencement surface  44   a  is formed to incline in the iron direction (the T direction) of the insertion optical fiber F from the middle portion thereof towards the distal end portion on the lower side thereof, this abutment commencement ice  44   a  begins to push the anchoring member  60  smoothly. 
   Then, when the cover body  40  has been rotated farther towards the holding position, the abutment commencement surface  44   a  of the guiding projecting portion  43  abuts the distal end side wall surface  66  of the anchoring member  60  along with the rotation of the cover body  40 . Subsequently, the abutment commencement surface  44   a  contacts the distal end side wall surface  66  of the anchoring member  60  and presses the anchoring member  60 . Thereby, the anchoring member  60  is moved by pressing the back end side thereof. Then, as shown in  FIG. 14E , the engaging projection portions  65  provided on this anchoring member  60  are fit into the long engaging holes  46  provided on the cover body  40 . In this manner, the cover body  40  is positioned at the holding position. That is, axis H in the insertion of the insertion optical fiber F and the axis I of the cover body  40  are at overlapping positions. Note that the engaging projection portion  65  provided on the anchoring member  60  is fit into the long engaging holes  46  so as to allow play. 
   When the cover body  40  is in the stand-by state, the abutment holding surface  44   b  of the guiding projection portion  43  abuts the distal end side wall surface  66  of the anchoring member  60 . That is, the abutment holding surface  44   b  of the guiding projection portion  43 , which is formed so as to be orthogonal to the insertion direction (the T direction) of the insertion optical fiber F, preferably restricts the movement of the anchoring member  60  towards the distal end side. When the cover body  40  is in the holding state, the insertion unit  70  is operated such that the insertion members  75  are extracted from the clamped elements  36  and  37 . Thereby, the inner optical fiber G and the insertion optical fiber F (bare optical fiber F 1 ) are clamped by being fit between the elements  36  and  37  while the distal end thereof are abutted. Note that the reference letter L in the figure denotes the distance between the anchoring member  60  and the connector body  10  in the holding state. 
   As explained above, because the anchoring member  60  is moved by smoothly pressing the back end side thereof, the reference letter L (the distance between the anchoring member  60  and the connector body  10  in the holding state) is longer than the reference letter K (the distance between the anchoring member  60  and the connector body  10  in the stand-by state). Thereby, the bending E in the holding state can be made small in comparison to the bending in the stand-by state. Concretely, in the example shown in the figures, the reference numeral L is only 0.2 mm longer than the reference numeral K. Specifically, the bending E is reduced from 0.5 mm to 0.3 mm. Note that here, when the amount of bending becomes too small, the abutment force between the back end of the inner optical fiber G and the distal end of the inner optical fiber F (bare optical fiber F 1 ) becomes insufficient, and there may be cases in which loss may occur to the propagated light. 
   That is, when the optical connector  1  is constructed as described above, when the back end of the inner optical fiber G and the distal end of the insertion optical fiber F (bare optical fiber F 1 ) are abutted, it is possible to confirm 0.5 mm, which is an amount of bending that can be easily confirmed visually, and furthermore, 0.3 mn, in which loss during propagation is small, is an amount of bending that can be confirmed when the back end of the inner optical fiber G and the distal end of the insertion optical fiber F (bare optical fiber F 1 ) have abutted. Thereby, the inconvenience of the loss of propagated light that occurs when the bending is large is eliminated, and thereby an optical connector is obtained in which the inner optical fiber G and the insertion optical fiber F are advantageously connected and the light propagates favorably. Note that when the bending is reduced in this manner, there is particular advantage when a pressure force is applied that occurs when the optical connector  1  is connected to another optical connector. 
   In addition, because the retraction restricting convexity  45  restricts the retraction of the anchoring member  60 , the extraction of this anchoring member  60  from the cover body  40  is advantageously restricted. In addition, because the engaging projection portions  65  of the anchoring member  60  are fit into the long engaging holes  46  of the cover body  40  so as to allow play, they can respond flexibly during elastic deformation. 
   In addition, because latch portions  15  are provided, detachment is easy when this optical connector  1  is connected to another optical connector. In addition, the inner optical fiber G and the insertion optical fiber F can be fastened in an instant in an abutted state by extracting the insertion members  75 . 
   In addition, because a material having property values for the flexural strength of 60 MPa or greater, an flexural modulus of 1770 MPa or greater, and an elongation at break of 170% or greater was selected as the material for the anchoring member  60 , even in a low temperature environment in which the brittleness increases, during the assembly, the hinge portion  62   c  formed of a thin wall fractured with difficulty. In addition, even when the insertion optical fiber F was pulled, the insertion optical fiber F favorably resisted this pulling force without changing, and was favorably held by this anchoring member  60 . 
   Note that the present invention is not limited to the preferred embodiments, and alterations are possible that do not depart from the gist of the present invention. In the embodiments described above, a case in which the optical connector has a cylindrical shaped ferrule was explained, but this is not limiting. For example, an optical connector having a substantially rectangular shaped ferrule can be used. As long as the structure of the clamping portion is one in which the optical fibers are aligned and the abutment connection between the end surfaces is clamped and held, the structure and shape are not particularly limited. For example, the number of lid bodies opposite to the base body of the elements may be one or plural. 
   The present invention can be applied to an optical connector in which the optical fiber holes are formed in plurality in a ferrule, and connection optical fibers (first optical fibers) are housed in each of the optical fiber holes. In this case, if the number of alignment structures such as positioning grooves provided on the clamping portion is at least the same as the number of connection optical fibers, each of the optical fibers terminated so as to be optically connectable by the optical connector can be optically connected with the connection optical fibers by the aligning mechanism. An example of this type of optical connector is the MT-type optical connector ferrule (MT: mechanically transferable) having a ferrule stipulated in JIS C 5981 or the like.