Source: https://patents.google.com/patent/JP2008286893A/en
Timestamp: 2020-01-29 14:19:28
Document Index: 416387073

Matched Legal Cases: ['art 8', 'art 8', 'arts 19', 'art 8', 'art 8', 'art 17', 'arts 33', 'art 8']

JP2008286893A - Optical connector - Google Patents
JP2008286893A
JP2008286893A JP2007129968A JP2007129968A JP2008286893A JP 2008286893 A JP2008286893 A JP 2008286893A JP 2007129968 A JP2007129968 A JP 2007129968A JP 2007129968 A JP2007129968 A JP 2007129968A JP 2008286893 A JP2008286893 A JP 2008286893A
JP2007129968A
2007-05-16 Application filed by Yazaki Corp, 矢崎総業株式会社 filed Critical Yazaki Corp
2007-05-16 Priority to JP2007129968A priority Critical patent/JP2008286893A/en
2008-11-27 Publication of JP2008286893A publication Critical patent/JP2008286893A/en
<P>PROBLEM TO BE SOLVED: To provide an optical connector capable of reducing a space for optical coupling. <P>SOLUTION: When a rotating operation of a cap 9 is performed, with the cam holes 24, 24 of the cap 9 inserted onto the projecting pins 23, 23 of a cylinder part 8, the flange 12 of a ferrule 2 is elastically pressed with the contact face 29 of the cap 9 and pushed into the depth of the cylinder part 8. Since the cap 9 is a member rotating around the ferrule 2, it requires no large space in the axial direction of optical fibers 3, 3 for the purpose of optical coupling. The contact face 29 of the cap 9 comes in elastic contact with the flange 12 of the ferrule 2 and forces the ferrule 2 down. <P>COPYRIGHT: (C)2009,JPO&INPIT
The present invention relates to an optical connector for optically coupling optical fibers.
In order to reduce the optical loss of the optical coupling portion in optical communication, a structure for biasing the ferrule using the biasing force of the spring and minimizing the gap of the optical coupling portion is disclosed in Patent Document 1 below. Technology is known.
The technique disclosed in Patent Document 1 below requires a spring and a pressing member for pressing the spring. Therefore, when using this technique, parts management becomes complicated and assembly is troublesome. It has the problem of hanging.
In order to solve such problems, a technique disclosed in Patent Document 2 below has been proposed.
JP-A-11-174277 JP 2005-258284 A
The technique disclosed in Patent Document 2 below has a structure in which the other side is pulled in using a lever to perform optical coupling. However, in this lever type structure, it is necessary to set a long distance between the lever fulcrum and the force point, and a space for the length is required, so that sufficient space must be secured in the axial direction of the optical fiber. It has the problem of having to.
This invention is made | formed in view of the situation mentioned above, and makes it a subject to provide the optical connector which can make the space for performing optical coupling small.
In order to solve the above-mentioned problems, the optical connector of the present invention according to claim 1 is provided with a ferrule that is attached to an end of an optical fiber, a cylindrical portion that is inserted into and guides the ferrule, and is inserted into the cylindrical portion. A cap that is attached to both the ferrule and the tube portion during optical coupling by the ferrule, and further, the ferrule is provided with a flange that contacts the cap, and the ferrule is inserted into the tube portion. Protruding pins that project in a direction perpendicular to the direction are provided, and the cap is inserted into the projecting pin, a contact surface that contacts the flange, an optical fiber lead-out hole that penetrates a part of the contact surface When the cap is rotated in this state, a cam hole is provided in which the ferrule moves in the insertion direction due to the presence of the protruding pin. It is characterized in.
According to the present invention having such a feature, when the cam hole of the cap is inserted into the projecting pin of the cylindrical portion and the cap is rotated in this state, the flange is pushed against the contact surface of the cap. It is pushed into the back of the tube. The ferrule is pushed to a position that is optimal for optical coupling. The ferrule can be removed by rotating the cap in the reverse direction. According to the present invention, the cap is a member that rotates around the ferrule and the optical fiber, and does not require a large space in the axial direction of the optical fiber for optical coupling.
An optical connector according to a second aspect of the present invention is the optical connector according to the first aspect, wherein the portion of the cap where the contact surface is located has elasticity.
According to the present invention having such a feature, the cap elastically contacts the ferrule and presses the ferrule. Since the force of pushing from the cap always acts on the ferrule, the state in which the ferrule is inserted into the cylinder portion without being loose is maintained.
According to the first aspect of the present invention, there is an effect that the space for optical coupling can be remarkably reduced as compared with the conventional case. Moreover, according to the second aspect of the present invention, there is an effect that the optical coupling can be satisfactorily maintained while suppressing backlash.
Hereinafter, description will be given with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of an optical connector of the present invention. 2 is a cross-sectional view showing a state before the cap rotating operation, FIG. 3 is a cross-sectional view showing an optical coupling state after the cap rotating operation, and FIG. 4 is a perspective view of the ferrule of the optical fiber terminal. 5 is a perspective view of a state in which the ferrule is inserted into the cylindrical portion, FIG. 6 is a perspective view of the cap, FIG. 7 is a view related to the cam hole of the cap, and FIG. 8 is a front view of the optical connector after the cap is rotated. 9 is a side view of the optical connector after the cap is rotated, and FIG. 10 is a plan view of the optical connector after the cap is rotated.
In FIG. 1, reference numeral 1 indicates an optical connector of the present invention. The illustrated optical connector 1 is fixed on a printed circuit board and soldered to be electrically connected. Further, the optical fibers 3 and 3 can be optically coupled via the ferrule 2.
The illustrated optical connector 1 is sometimes called an optical module or a light emitting / receiving unit.
1 to 3, an optical connector 1 includes a ferrule 2 attached to the ends of optical fibers 3 and 3, two FOTs (Fiber Optic Transceivers) 4 each having a light emitting element and the other having a light receiving element, An FOT case 5 that houses the two FOTs 4; two covers 6 that fit into the FOT case 5 and hold the FOTs 4; and a shield case 7 that covers the FOT 4 and the FOT case 5 to take electromagnetic noise countermeasures; The cap 9 is configured to be attached to and rotated on both the ferrule 2 and a tube portion 8 of the FOT case 5 described later at the time of optical coupling. Hereafter, each said structure is demonstrated.
As the optical fibers 3 and 3, known POF (Plastic Optical Fiber) is adopted (this is an example and the type is not particularly limited). A ferrule 2 is attached to the ends of the optical fibers 3 and 3 by, for example, an adhesive or laser welding.
2 to 4, the ferrule 2 is a member made of synthetic resin, and is not a member separated so as to correspond to each optical fiber 3, but is integrated as shown. More specifically, the ferrule 2 has fiber fixing portions 10 and 10 for inserting and fixing the optical fibers 3 respectively, and a connecting portion 11 for connecting the fiber fixing portions 10 and 10 as shown in the figure. It is formed into a shape.
The ferrule 2 has several other flanges. The flange 12 closest to the outlet of the optical fiber 3 is provided so as to straddle the rear portions of the fiber fixing portions 10 and 10. The flange 12 has a flat surface. This flat surface is formed as a ferrule side contact surface 13 with which the cap 9 contacts. The ferrule side contact surface 13 is a surface parallel to a surface orthogonal to the axis of the optical fiber 3.
The flange 14 closest to the ferrule tip, at which the end face of the optical fiber 3 is exposed, is formed so as to function as a stopper when the ferrule 2 is inserted into a cylindrical portion 8 to be described later of the FOT case 5.
A shaft support hole 16 into which a later-described rotating shaft 15 of the cap 9 is inserted is formed in the connecting portion 11. The shaft support hole 16 is formed in the center of the flange 12 so as to open with a predetermined diameter. The shaft support hole 16 is formed with a depth sufficient to suppress the backlash of the rotary shaft 15 described later of the cap 9.
2 and 3, the FOT 4 is known and has a resin-molded package portion 17 and a plurality of lead frames 18 (see FIGS. 8 and 9; omitted in FIGS. 2 and 3). is doing. Each lead frame 18 is formed in a bent state in an L shape. The lead frame 18 having such a shape is inserted into the connection hole of the printed board and soldered to be connected to a desired circuit. The FOT 4 is not particularly denoted by a symbol, but is formed with a coupling portion where the tip of the ferrule 2 is inserted and optical coupling is performed.
2, 3, and 5, the FOT case 5 is a resin molded product that is molded using a synthetic resin material having an insulating property, and stores the FOT 4 that houses and fixes the package portion 17 of each FOT 4. Parts 19 and 19 and a cylindrical part 8 into which the ferrule 2 is inserted and guided. Fixing pins 20 and 20 for fixing the package portion 17 of the FOT 4 and fitting portions 21 and 21 for the cover 6 are formed in the FOT storage portions 19 and 19.
The cylinder portion 8 is formed so that the inside thereof becomes a storage portion for the ferrule 2. Moreover, the cylinder part 8 is formed so that the ferrule 2 can be guided toward each FOT4. The tube portion 8 is formed so that the ferrule 2 inserted into the tube portion 8 does not rotate around the axis of the ferrule 2. Abutting portions 22 and 22 with which the flange 14 of the ferrule 2 abuts are formed at the back of the cylindrical portion 8.
Protruding pins 23 and 23 are provided on the outer surface of the cylindrical portion 8. The projecting pins 23 and 23 are provided so as to project in a direction orthogonal to the insertion direction of the ferrule 2 (axial direction of the ferrule 2) (direction in which the fiber fixing portions 10 and 10 of the ferrule 2 are arranged). The projecting pins 23 and 23 are formed in a cylindrical shape so that cam holes 24 and 24 described later of the cap 9 can smoothly slide. The protruding pins 23, 23 are formed with a taper (not shown) at the tip thereof to avoid catching when the cap 9 is attached.
2 and 3, the cover 6 is a resin molded product that is molded using a synthetic resin material having insulating properties like the FOT case 5. When the cover 6 is fitted into the FOT storage portions 19, 19, It is formed so that the back surface of the package part 17 can be pressed.
2, 3, and 5, the shield case 7 is formed in a substantially box shape so that the printed circuit board side is opened by punching a metal plate having conductivity and bending it. The shield case 7 has a lower opening and an upper wall 25, and has left and right side walls and front and rear side walls. The shield case 7 covers the FOT case 5 in the state in which each FOT 4 is accommodated by inserting the FOT case 5 from the lower opening toward the upper wall 25, and locks the inserted FOT case 5 or the like with, for example, the front and rear side walls. It is formed so that it can be.
In the upper wall 25 of the shield case 7, an upper opening for inserting the tube portion 8 of the FOT case 5 is formed. On the side wall of the shield case 7, a plurality of various leg portions 26 functioning as a fixing portion and a ground portion for the printed circuit board are provided.
1 to 3, 6, and 7, the cap 9 is a resin molded product molded using a synthetic resin material, and is coupled to a circular upper wall 27 and a peripheral edge of the upper wall 27. And a side wall 28. As described above, the cap 9 is formed as a member that is attached to both the ferrule 2 and the cylindrical portion 8 of the FOT case 5 and rotates when optically coupled.
In this embodiment, the cap 9 is formed so that the upper wall 27 has elasticity (assumed to be an example. Since the ferrule 2 can be pressed down, it is preferable to have elasticity). . With respect to the material of the cap 9, it may be provided with an insulating property or may be mixed with carbon or the like. When carbon or the like is blended, the cap 9 is formed in a shape that comes into contact with the upper wall 25 of the shield case 7.
On the inner surface of the upper wall 27, a rotating shaft 15 to be inserted into the shaft support hole 16 of the ferrule 2 is provided. The rotation shaft 15 is provided at the center of the inner surface of the upper wall 27. The rotating shaft 15 is formed in a pin shape having a predetermined length. The inner surface of the upper wall 27 is formed on a contact surface 29 that contacts and slides on the flange 12 (ferrule side contact surface 13) of the ferrule 2. Two optical fiber lead-out holes 30 are formed through the upper wall 27. The optical fiber lead-out holes 30 and 30 are formed so that the optical fibers 3 and 3 can be respectively inserted (see FIG. 10).
The side wall 28 is formed with cam holes 24 and 24 which are inserted into and guided by the projecting pins 23 and 23 of the cylindrical portion 8 of the FOT case 5. The cam holes 24, 24 are formed so as to be continuous with the opening edge of the side wall 28. When the cap hole 24 is inserted into the projecting pins 23 and 23 of the cylindrical portion 8 and the cap 9 is rotated, the ferrule 2 moves in the insertion direction due to the presence of the projecting pins 23 and 23. It is formed in a simple groove shape.
The cam holes 24, 24 have one end continuous to the opening edge of the side wall 28 and extend short along the insertion direction, and one end is oblique to the other end of the straight groove portions 31, 31. Diagonal groove portions 32, 32 extending upward, and lock portions 33, 33 formed at the other end of the oblique groove portions 32, 32 and slightly recessed. The lock parts 33 and 33 can form a locked state by the projecting pins 23 and 23 of the cylinder part 8 falling into this part.
On the side wall 28, a streak-like anti-slip 34 is formed which serves as an anti-slip when the cap 9 is rotated.
An operation related to optical coupling and the like will be described based on the above configuration.
First, as shown in FIG. 4, the work of attaching the ferrule 2 to the ends of the optical fibers 3 and 3 is performed. At this time, although not particularly shown, the cap 9 is inserted in advance into the optical fibers 3 and 3, and the cap 9 is slid to a position where it does not interfere with the work. The operation | work which attaches the ferrule 2 is performed in this state.
Next, as shown in FIG. 5, the work of inserting the ferrule 2 into the tube portion 8 of the FOT case 5 on the light emitting / receiving side assembled in advance and fixed on the printed board is performed. In this operation, the ferrule 2 is simply inserted into the cylindrical portion 8.
Subsequently, the cap 9 inserted in advance in the optical fibers 3 and 3 is slid, and the cap 9 is attached so as to straddle the ferrule 2 and the cylindrical portion 8 (see FIG. 2). At this time, the straight groove portions 31 and 31 of the cam holes 24 and 24 of the cap 9 are guided by the projecting pins 23 and 23 of the cylindrical portion 8. The projecting pins 23, 23 abut the continuous portions of the straight groove portions 31, 31 and the oblique groove portions 32, 32 of the cam holes 24, 24.
Finally, an operation (rotation operation) of rotating the cap 9 is performed until the locked state is formed by sliding between the projecting pins 23 and 23 and the oblique groove portions 32 and 32 (see FIGS. 1, 8, and 9). ). At this time, the contact surface 29 of the cap 9 comes into contact with the flange 12 of the ferrule 2 and slides. The ferrule 2 is pushed toward the back of the cylindrical portion 8. That is, it is pushed toward each FOT 4. When the projecting pins 23 and 23 fall into the lock portions 33 and 33 to form a locked state, the ferrule 2 faces each FOT 4 at the optimum position (see FIG. 3).
On the other hand, when the cap 9 is turned in the opposite direction, the force pressing the ferrule 2 is released. Then, when the cap 9 is removed from the ferrule 2 and the tube portion 8, the ferrule 2 can be removed from the tube portion 8.
As described above with reference to FIGS. 1 to 10, according to the present invention, the rotation of the cap 9 is performed with the cam holes 24, 24 of the cap 9 inserted into the projecting pins 23, 23 of the cylindrical portion 8. When the moving operation is performed, the flange 12 of the ferrule 2 is elastically pushed by the contact surface 29 of the cap 9 and pushed into the inner part of the cylindrical portion 8. Since the cap 9 is a member that rotates around the ferrule 2, a large space is not required in the axial direction of the optical fibers 3 and 3 for optical coupling.
Therefore, according to the present invention, there is an effect that the space for optical coupling can be remarkably reduced as compared with the prior art.
In addition, according to the present invention, the contact surface 29 of the cap 9 is elastically brought into contact with the flange 12 of the ferrule 2 to press the ferrule 2, so that the play of the ferrule 2 can be suppressed. Therefore, there is an effect that the optical coupling can be maintained well.
It goes without saying that the present invention can be variously modified without departing from the spirit of the present invention.
It is a perspective view showing one embodiment of the optical connector of the present invention. It is sectional drawing which shows the state before cap rotation operation. It is sectional drawing which shows the optical coupling | bonding state after the rotation operation of a cap. It is a perspective view of the ferrule of an optical fiber terminal. It is a perspective view of the state which inserted the ferrule in the cylinder part. It is a perspective view of a cap. It is a figure concerning the cam hole of a cap. It is a front view of the optical connector after rotation operation of a cap. It is a side view of the optical connector after the rotation operation of a cap. It is a top view of the optical connector after the rotation operation of a cap.
1 Optical connector 2 Ferrule 3 Optical fiber 4 FOT (Fiber Optic Transceiver)
5 FOT case 6 Cover 7 Shield case 7
8 Tube portion 9 Cap 10 Fiber fixing portion 11 Connection portion 12 Flange 13 Ferrule side contact surface 14 Flange 15 Rotating shaft 16 Shaft support hole 17 Package portion 18 Lead frame 19 FOT storage portion 20 Fixing pin 21 Fitting portion 22 Contact portion 23 Protruding pin 24 Cam hole 25 Upper wall 26 Leg 27 Upper wall 28 Side wall 29 Contact surface 30 Optical fiber lead-out hole 31 Straight groove portion 32 Diagonal groove portion 33 Lock portion 34 Non-slip
A ferrule that attaches to the end of the optical fiber, a cylindrical part that guides and guides the ferrule, and a cap that attaches to both the ferrule and the cylindrical part when optically coupled by the ferrule inserted into the cylindrical part; Further, the ferrule is provided with a flange that contacts the cap, the cylindrical portion is provided with a projecting pin that projects in a direction perpendicular to the insertion direction of the ferrule, and the cap has the flange When the cap is rotated while being inserted into the projecting pin, a contact surface that contacts the optical fiber, an optical fiber lead-out hole penetrating a part of the contact surface, the ferrule is moved by the presence of the projecting pin. An optical connector comprising a cam hole that moves in the insertion direction.
The optical connector according to claim 1, wherein a portion of the cap having the contact surface has elasticity.
JP2007129968A 2007-05-16 2007-05-16 Optical connector Pending JP2008286893A (en)
JP2007129968A JP2008286893A (en) 2007-05-16 2007-05-16 Optical connector
JP2008286893A true JP2008286893A (en) 2008-11-27
ID=40146701
JP2007129968A Pending JP2008286893A (en) 2007-05-16 2007-05-16 Optical connector
JP (1) JP2008286893A (en)
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